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station this is houston are you ready

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houston station i'm ready for the event

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bert church high school this is mission

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control houston please call station for

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station this is bonnie schmidt from

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let's talk science with students here at

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burt church high school how do you hear

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well hello uh birch church high school

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and uh

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and the folks at let's talk science i

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read you loud and clear greetings and

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welcome aboard the international space

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hi chris it's bob thursk here uh there's

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a thousand students uh teachers parents

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and other officials here i'll turn you

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over to our first student who has a

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question

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you when you first get here it is so

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weird your body is so confused without

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gravity

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all sorts of things change

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and you feel sick you feel congested it

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feels like you're recovering from an

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illness or something so

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it takes a while just for your body to

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adapt but then once your body adapts

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then the other thing that you need to do

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to adjust is just start to get

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elegant in weightlessness how to move

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and fly around without bumping into

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things and knocking stuff off the walls

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and crashing into things

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and i found that my body recovered in uh

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three or four days and felt pretty good

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but to become elegant and and graceful

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in space took about a month but now i

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feel completely adapted and adjusted and

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i'm gavin and my question is since

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you're in space for five months

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are you worried about how your body will

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yes uh as you well know the our sun and

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every star in the universe

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is a huge

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nuclear furnace pouring out radiation

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it's what keeps us alive the heat and

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the energy from the from our sun

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but without our atmosphere and the

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earth's magnetic field to protect us uh

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the radiation is much higher and here on

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the space station we still have the

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magnetic field but we don't have the

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atmosphere and so we're interested in it

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and my body

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of course stops radiation and when the

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radiation hits my body it it can do

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damage at the cellular level

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uh we're doing an experiment here on

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board just as you folks are with let's

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talk science with a small detector

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and uh

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and with that we can try and track the

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radiation damage or at least

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dosage in our bodies

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um but i of course was worried about it

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before flight i talked to our

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radiation experts and our scientists and

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uh we don't want to risk the lives any

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more than we have to of of the people

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that are exploring space

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and um

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there's a slightly increased level of

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radiation exposure but it's not that far

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different than people who work in the uh

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in the industry people who work around

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x-ray machines pilots who fly at high

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altitude or even someone who chooses to

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live their whole life at a high altitude

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in la paz or even in denver somewhere

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hi my name is caitlin and my question is

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if humans were to live on mars would

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they be more exposed to radiation than

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caitlin yes

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mars

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with rovers on the surface and some of

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the spaceships that are orbiting mars uh

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coming from countries all around the

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world canadian hardware is on the

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surface of mars right now

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but what we found is mars has some weak

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magnetic field but not very much so it

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doesn't protect the planet very much

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that way and it has an atmosphere but

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not a very thick atmosphere and not a

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lot of water vapor and so it doesn't

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soak up much radiation it protects you

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better than empty space than the the gap

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in between mars and the earth but it's

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not like being home not like mother

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earth so when we do go to mars and

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hopefully you'll be one of the people

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standing on mars

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you will need to have brought with you

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radiation protection it's not that hard

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to do we know how to do it you just have

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hi i'm taylor and i would like to know

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operating canadarm2 is so much fun in

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fact you can operate it from right here

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you have two

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hand controllers or joysticks and you

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turn it with your right hand and you

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move it up and down and back and forth

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with your left hand so uh moving like a

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big elegant version of your arm except

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instead of your arm

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it's got a hand at both ends so it's got

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two wrists and an elbow so you can

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really move the cannon arm much more

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than you can move your own arm so you

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have to pay attention you got to look at

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the screens plan ahead but the actual

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flying of canadarm2 is a real joy and i

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got to fly canadarm the original one on

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the shuttle i've

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used the one here on the space station

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several times and

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it's easy because of the training it's

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intuitive it's fun but also it just

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makes me feel great as a canadian to be

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operating canadarm2 on the international

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hi i'm justina and i would like to know

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what was the most challenging part of

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the most challenging part of becoming an

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astronaut

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i swear is getting selected canada has

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only chosen a small handful of

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astronauts in our whole history as a

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nation

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and

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the the selection process is so rigorous

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and so demanding that i was really

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nervous and and i know that bob thirst

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was there with you probably felt the

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same way when he was selected in fact

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bob was part of the team that looked

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over the applicants to try and see if

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i'd be a good astronaut or not so thank

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you bob

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but that was the hardest part was

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getting through that door but then once

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you're an astronaut then i think the

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hardest part is just remembering

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everything you people are trying to

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teach you important things for years and

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years and years and you need to know

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them all to live and work here and so

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i think the hardest part of being an

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astronaut is is remembering all of the

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key information that'll let you be

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chris it's uh bob here just wanted to

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say we did a fine job selecting you as

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an astronaut uh and i was just going to

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ask you if you can do some a somersault

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for us show us what weightlessness is

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well being weightless is just so much

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fun there's there's no up or down it's

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completely arbitrary you can you can

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choose completely which way you want to

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go and bob you've been here and you know

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exactly what it's like so

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you could just uh

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float and turn and tumble and do a

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thousand somersaults and

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you can do an interview with students in

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thank you

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i'm miranda and i'm just wondering does

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the food taste the same in orbit as it

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miranda uh at first no and it's not

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because of the food it's because when

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you first get to space

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um

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gravity

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of course is not pushing the blood to

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your feet anymore no because you're

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basically weightless so your body has

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learned over your whole lifetime to

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squeeze the blood up to your head so you

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don't faint and that's kind of fighting

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because normally your body has to work

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against gravity and it doesn't recognize

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immediately there's no gravity so your

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body keeps squeezing the blood up to

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your head but no gravity to push it back

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down again so your head sort of inflates

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like someone was squeezing the bottom of

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a balloon and so your head fills up with

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fluid and your sinuses fill up so when

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you first get to space within a little

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while you're all clogged up and sinus

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plugged up so you can't even taste your

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food and that lasts several days until

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your body finally gets to equilibrium

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and then the food tastes about the same

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and i have

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canadian food right here that folks were

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nice enough to send up to me which

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just came up on the dragon spaceship

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recently but i have a lot of nice

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food i have canadian maple cookies

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i have a smoked salmon pate

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some canadian chocolate

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uh look at this a tube a tube of maple

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syrup

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which uh is a real treat up here really

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high quality maple syrup and from not to

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away far away from you guys from

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saskatchewan i have some

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buffalo jerky right here

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cranberry flavored buffalo jerky and uh

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and we even have something from the east

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coast here with the blueberry

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granola bar so we have lots of food

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it keeps us healthy

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it tastes good and it also it's a really

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important social time of the day when

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you can get together talk about what

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everybody's doing and uh and relax and

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really try and share the human part of

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hi

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does it take to travel to the

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karen uh it took us two days

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but it it doesn't have to take that long

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uh you launch out of a rocket pad a

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launch pad in baikonur kazakhstan bob

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and i have both done this a russian

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rocket called a soyuz

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and the space station is somewhere

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around the world and you sort of play

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play chase a tail chase and you have to

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get just to the right points you can

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come up and dock

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well

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you could do it quickly but it's kind of

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nice to have a little time to adapt and

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check out all your equipment but then

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again

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you run a bit of a risk with your little

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spaceship of any moment it's not on the

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earth or docked to the space station if

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something breaks then

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you run a risk so this next space launch

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that's going to happen in about three

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weeks they're actually going to launch

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and dock in six hours so they'll be sit

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just imagine if uh

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today

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right now you launched six hours from

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now i mean by by supper time you could

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be up and dock with the space station so

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hi my name is emily and do you see

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satellites in the other planet through

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emily we're

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yes we do um

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but not that much differently than on

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earth

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uh of course the other planets are are

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millions of kilometers away and we're

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only a few hundred kilometers away so

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even the moon

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although it's very slightly clearer and

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very very slightly bigger

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we're much much closer to the earth so

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even the moon looks

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pretty much the same the other planets

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were not far enough away from the earth

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to have a significant difference

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stars uh look differently just because

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there's no air in the way so they don't

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twinkle

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they're not scintillating because of the

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atmosphere so they're nice and clear

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and other satellites

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most of them are well above us most of

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the satellites we're kind of in the

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minimum orbit that you would want to be

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so you only see them as little points of

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00:12:21,829 --> 00:12:19,440
light going by and you only see them

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rarely but any clear night in alberta if

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you go outside just around sunrise or

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just after sunset and wait and you'll

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see satellites go over sometimes you can

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00:12:36,470 --> 00:12:31,519
see this satellite go over and that's

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okay

293
00:12:47,430 --> 00:12:40,720
i'm alexi and what does a launch feel

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alexi for launch you're lying on your

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00:12:55,509 --> 00:12:50,959
so

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00:12:58,629 --> 00:12:55,519
it's hard to be stable you're lying like

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this and you're accelerating that way

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00:13:01,350 --> 00:12:59,360
so

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00:13:04,230 --> 00:13:01,360
all of the force is on your body this

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00:13:05,750 --> 00:13:04,240
way squishing you down into your seat

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00:13:07,350 --> 00:13:05,760
and

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00:13:09,269 --> 00:13:07,360
you know you could build a rocket ship

303
00:13:11,030 --> 00:13:09,279
that could have a lot more acceleration

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00:13:13,350 --> 00:13:11,040
than the human body could take so it's

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00:13:15,829 --> 00:13:13,360
kind of a trade-off and we've decided

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00:13:17,910 --> 00:13:15,839
about four or five times your body's

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00:13:19,750 --> 00:13:17,920
weight that's enough that's pretty heavy

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00:13:21,509 --> 00:13:19,760
on your face and your chest it's hard to

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00:13:23,430 --> 00:13:21,519
breathe you're wearing a lot of safety

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00:13:25,910 --> 00:13:23,440
equipment and so your rocket ship is

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00:13:27,750 --> 00:13:25,920
going that way super fast you're getting

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00:13:29,829 --> 00:13:27,760
squished into your seat there's some

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00:13:31,829 --> 00:13:29,839
vibration you can feel the rocket sort

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00:13:33,670 --> 00:13:31,839
of steering like like a boat going

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00:13:35,590 --> 00:13:33,680
through the waves as it's steering to

316
00:13:38,150 --> 00:13:35,600
get exactly to the right orbit and it

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00:13:40,069 --> 00:13:38,160
gets quite heavy as you burn the fuel

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00:13:41,590 --> 00:13:40,079
the rocket of course gets lighter and

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00:13:43,110 --> 00:13:41,600
lighter so

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00:13:44,629 --> 00:13:43,120
uh so even though the engines are

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00:13:45,829 --> 00:13:44,639
putting up the same amount of force

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00:13:46,790 --> 00:13:45,839
because you're getting lighter and

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00:13:48,550 --> 00:13:46,800
lighter

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00:13:50,230 --> 00:13:48,560
then it feels a higher and higher

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00:13:52,310 --> 00:13:50,240
acceleration so you get squished more

326
00:13:53,750 --> 00:13:52,320
and more f equals ma

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00:13:55,110 --> 00:13:53,760
um so

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00:13:57,509 --> 00:13:55,120
by the end of it you're getting pretty

329
00:13:59,829 --> 00:13:57,519
heavily squished into your chair uh but

330
00:14:01,509 --> 00:13:59,839
it's a heck of a ride it only takes

331
00:14:03,430 --> 00:14:01,519
we've been talking for a little over 10

332
00:14:05,509 --> 00:14:03,440
minutes it takes less time than that to

333
00:14:07,670 --> 00:14:05,519
get to space from the time the engine's

334
00:14:09,990 --> 00:14:07,680
light until you get to space

335
00:14:12,470 --> 00:14:10,000
it is only about nine minutes and it's a

336
00:14:14,629 --> 00:14:12,480
rough ride but boy it is a ride i'd be

337
00:14:16,069 --> 00:14:14,639
happy to do again and it's a ride that

338
00:14:17,030 --> 00:14:16,079
takes you someplace you can't get any

339
00:14:22,710 --> 00:14:17,040
other way

340
00:14:27,430 --> 00:14:25,350
hi i'm ashley do you have a form 45

341
00:14:33,269 --> 00:14:27,440
minute day and then a 45 minute night

342
00:14:39,189 --> 00:14:34,949
ashley uh

343
00:14:43,350 --> 00:14:41,829
so let's say that this is the world okay

344
00:14:44,389 --> 00:14:43,360
this roll i'll get a little closer you

345
00:14:45,990 --> 00:14:44,399
can see

346
00:14:47,110 --> 00:14:46,000
let's say that this great tape is the

347
00:14:47,990 --> 00:14:47,120
world

348
00:14:50,389 --> 00:14:48,000
so

349
00:14:51,910 --> 00:14:50,399
we're going around the world but if you

350
00:14:53,750 --> 00:14:51,920
guys are the sun

351
00:14:55,430 --> 00:14:53,760
then sometimes we go around the world

352
00:14:57,030 --> 00:14:55,440
this way and if that's the case then

353
00:14:58,870 --> 00:14:57,040
you're right you'd be in the sun for

354
00:15:00,389 --> 00:14:58,880
about 45 minutes and then you'd be

355
00:15:03,590 --> 00:15:00,399
behind the world in the shade for about

356
00:15:05,990 --> 00:15:03,600
45 minutes but our orbit precesses and

357
00:15:07,990 --> 00:15:06,000
sometimes we go around the world

358
00:15:09,430 --> 00:15:08,000
sort of this way and if you're going

359
00:15:11,269 --> 00:15:09,440
around the world this way then if you

360
00:15:13,189 --> 00:15:11,279
think about it if you guys are the sun

361
00:15:15,430 --> 00:15:13,199
then you might come into the sun right

362
00:15:17,750 --> 00:15:15,440
here and you'd be in the sun almost your

363
00:15:20,310 --> 00:15:17,760
whole orbit until you came around to the

364
00:15:22,310 --> 00:15:20,320
shadow again sort of following

365
00:15:23,990 --> 00:15:22,320
almost the sunset line on the world all

366
00:15:26,230 --> 00:15:24,000
the way around and sometimes that

367
00:15:28,230 --> 00:15:26,240
happens where you're sort of at an

368
00:15:31,590 --> 00:15:28,240
oblique angle to the sun and so you get

369
00:15:32,629 --> 00:15:31,600
a lot of sort of dim sunshine until you

370
00:15:34,310 --> 00:15:32,639
come around and then you get a little

371
00:15:36,790 --> 00:15:34,320
bit of night on the other side so the

372
00:15:38,710 --> 00:15:36,800
maximum you can ever get is your 45 of

373
00:15:47,749 --> 00:15:38,720
night and then it gets less and less

374
00:15:52,629 --> 00:15:50,310
hi i'm haley and i was wondering can you

375
00:15:58,150 --> 00:15:52,639
feel the speed of the iss as it orbits

376
00:16:03,749 --> 00:16:00,790
you can't feel the speed haley it's sort

377
00:16:05,829 --> 00:16:03,759
of like you know that in alberta you're

378
00:16:07,509 --> 00:16:05,839
going pretty fast you know you see the

379
00:16:09,350 --> 00:16:07,519
sun rise on one side in the morning and

380
00:16:10,949 --> 00:16:09,360
it goes across and sets on the other

381
00:16:12,949 --> 00:16:10,959
side in the evening and that's because

382
00:16:15,829 --> 00:16:12,959
the world is turning so you've got a lot

383
00:16:17,030 --> 00:16:15,839
of speed you're moving fast

384
00:16:18,710 --> 00:16:17,040
but you don't feel it because

385
00:16:21,430 --> 00:16:18,720
everything's moving along with you and

386
00:16:23,829 --> 00:16:21,440
it's the same up here the only time you

387
00:16:24,949 --> 00:16:23,839
really get a sense of the fact that

388
00:16:26,550 --> 00:16:24,959
you're moving

389
00:16:28,870 --> 00:16:26,560
is sort of like where you are when you

390
00:16:31,110 --> 00:16:28,880
look at something else when you look at

391
00:16:32,470 --> 00:16:31,120
the sun you can tell as the sun rises

392
00:16:34,790 --> 00:16:32,480
and goes to the sky that you know the

393
00:16:36,870 --> 00:16:34,800
world is turning well for us when we

394
00:16:38,790 --> 00:16:36,880
look down at the earth especially if you

395
00:16:40,949 --> 00:16:38,800
look straight down we're going eight

396
00:16:42,790 --> 00:16:40,959
kilometers a second

397
00:16:44,389 --> 00:16:42,800
you know you could be in calgary in in

398
00:16:46,710 --> 00:16:44,399
just a few seconds

399
00:16:49,110 --> 00:16:46,720
and we right across canada in 10 minutes

400
00:16:51,030 --> 00:16:49,120
from the pacific to the atlantic so when

401
00:16:53,030 --> 00:16:51,040
you look straight down it's amazing how

402
00:16:54,710 --> 00:16:53,040
fast the world goes by and you actually

403
00:16:56,790 --> 00:16:54,720
even though we're a long ways up you get

404
00:17:00,710 --> 00:16:56,800
a ground rush just from the incredible

405
00:17:03,430 --> 00:17:00,720
speed we go uh 28 000 kilometers an hour

406
00:17:09,029 --> 00:17:03,440
almost 500 kilometers every minute it's

407
00:17:12,470 --> 00:17:10,870
hi i'm rachel and i'd like to know

408
00:17:19,829 --> 00:17:12,480
during the launch how do you know when

409
00:17:22,390 --> 00:17:21,029
that's that's an interesting question

410
00:17:24,470 --> 00:17:22,400
the um

411
00:17:26,150 --> 00:17:24,480
the purpose of the launch

412
00:17:28,230 --> 00:17:26,160
is of course number one to get you above

413
00:17:29,750 --> 00:17:28,240
the air because you can't go fast enough

414
00:17:31,909 --> 00:17:29,760
in the air there's too much friction

415
00:17:33,830 --> 00:17:31,919
with the air so first the rocket has to

416
00:17:35,750 --> 00:17:33,840
get you above the air and then it has to

417
00:17:37,270 --> 00:17:35,760
tip you over and get you going fast

418
00:17:38,549 --> 00:17:37,280
enough to stay in orbit because if

419
00:17:40,630 --> 00:17:38,559
you're not going fast enough you'll just

420
00:17:42,789 --> 00:17:40,640
fall back down into the air again but

421
00:17:45,430 --> 00:17:42,799
there's a certain speed that is just

422
00:17:47,510 --> 00:17:45,440
fast enough that will fall at the same

423
00:17:49,270 --> 00:17:47,520
rate that the earth curves away from you

424
00:17:51,110 --> 00:17:49,280
and so then you'll be weightless because

425
00:17:53,029 --> 00:17:51,120
you just keep falling just like i'm

426
00:17:55,110 --> 00:17:53,039
falling right now but because we're

427
00:17:56,710 --> 00:17:55,120
going fast enough we never fall down

428
00:18:00,150 --> 00:17:56,720
into the atmosphere the earth's

429
00:18:01,750 --> 00:18:00,160
curvature matches our fall rate so uh

430
00:18:03,590 --> 00:18:01,760
that speed is eight kilometers a second

431
00:18:05,430 --> 00:18:03,600
so when you're in your rocket ship

432
00:18:08,070 --> 00:18:05,440
it's getting you above the air and then

433
00:18:10,470 --> 00:18:08,080
it's accelerating like crazy squishing

434
00:18:12,310 --> 00:18:10,480
in your chair until it has calculated

435
00:18:14,470 --> 00:18:12,320
the computers and the rocket ship have

436
00:18:16,710 --> 00:18:14,480
calculated that you are at exactly the

437
00:18:19,270 --> 00:18:16,720
right height the right angle and the

438
00:18:22,630 --> 00:18:19,280
right speed and the engine shut off and

439
00:18:25,110 --> 00:18:22,640
at that moment at that moment you are in

440
00:18:27,029 --> 00:18:25,120
space and you are weightless because you

441
00:18:28,710 --> 00:18:27,039
go from being squished in your chair by

442
00:18:31,830 --> 00:18:28,720
the acceleration of the rocket to

443
00:18:33,830 --> 00:18:31,840
suddenly weightless and floating inside

444
00:18:35,350 --> 00:18:33,840
your rocket ship and it just happens

445
00:18:37,110 --> 00:18:35,360
just it's like

446
00:18:39,830 --> 00:18:37,120
it's like you were getting pummeled and

447
00:18:41,590 --> 00:18:39,840
beaten up and squished by you know some

448
00:18:44,390 --> 00:18:41,600
big fat gorilla sitting on you and then

449
00:18:51,750 --> 00:18:44,400
they picked up and threw you off a cliff

450
00:18:57,750 --> 00:18:55,510
hi mr hatfield i'm ashton and i was just

451
00:18:59,669 --> 00:18:57,760
wondering how does it feel to sleep

452
00:19:00,870 --> 00:18:59,679
while you're floating in there

453
00:19:06,230 --> 00:19:00,880
i mean and

454
00:19:10,789 --> 00:19:08,150
ash how does it feel to sleep

455
00:19:12,390 --> 00:19:10,799
here's how you do it okay so you uh you

456
00:19:14,710 --> 00:19:12,400
go i have a little sleeping room just

457
00:19:16,150 --> 00:19:14,720
over there uh when it's time on my watch

458
00:19:17,990 --> 00:19:16,160
to sleep because of course the only way

459
00:19:20,789 --> 00:19:18,000
to tell is by time because the sun's not

460
00:19:22,310 --> 00:19:20,799
right so you you go in you float down

461
00:19:24,070 --> 00:19:22,320
into your sleeping bag you put your feet

462
00:19:25,750 --> 00:19:24,080
into it you float your whole body into

463
00:19:27,750 --> 00:19:25,760
your sleeping bag and then the sleeping

464
00:19:29,590 --> 00:19:27,760
bag has arm holes so you put your arms

465
00:19:31,990 --> 00:19:29,600
through the armholes you do up the great

466
00:19:33,990 --> 00:19:32,000
big zipper and the sleeping bag is just

467
00:19:36,630 --> 00:19:34,000
has a couple little shoe laces tying it

468
00:19:39,110 --> 00:19:36,640
to the wall and that's all and then you

469
00:19:40,710 --> 00:19:39,120
just relax inside your sleeping bag and

470
00:19:41,430 --> 00:19:40,720
when you relax

471
00:19:43,029 --> 00:19:41,440
your

472
00:19:45,750 --> 00:19:43,039
knees it's sort of like

473
00:19:47,909 --> 00:19:45,760
if you ever seen a picture of a uh

474
00:19:50,470 --> 00:19:47,919
of a neonate you know inside their

475
00:19:52,390 --> 00:19:50,480
mother's womb where the body's floating

476
00:19:54,390 --> 00:19:52,400
um it's sort of like that your your

477
00:19:57,669 --> 00:19:54,400
knees come up your arms float up your

478
00:19:59,350 --> 00:19:57,679
head comes forward and you relax and

479
00:20:02,149 --> 00:19:59,360
every single muscle in your body is

480
00:20:04,789 --> 00:20:02,159
relaxed everyone you don't have to roll

481
00:20:06,630 --> 00:20:04,799
over you you don't need a pillow your

482
00:20:08,470 --> 00:20:06,640
shoulder doesn't get sore you don't get

483
00:20:10,149 --> 00:20:08,480
hot in one side and cold on the other

484
00:20:11,350 --> 00:20:10,159
you are completely

485
00:20:13,669 --> 00:20:11,360
relaxed

486
00:20:15,669 --> 00:20:13,679
so it's a wonderful way to sleep you

487
00:20:18,149 --> 00:20:15,679
just every joint is is completely

488
00:20:23,190 --> 00:20:18,159
relaxed in your body i love sleeping and

489
00:20:26,470 --> 00:20:24,789
commander hatfield is bonnie schmidt

490
00:20:28,230 --> 00:20:26,480
from let's talk science again we've just

491
00:20:30,149 --> 00:20:28,240
been notified that our downlink is

492
00:20:31,750 --> 00:20:30,159
ending but i want to thank you so much

493
00:20:33,830 --> 00:20:31,760
for joining us with everybody here at

494
00:20:36,870 --> 00:20:33,840
burt church high school you've made us

495
00:20:38,710 --> 00:20:36,880
so very proud and your your capacity to

496
00:20:40,789 --> 00:20:38,720
take millions of us on this incredible

497
00:20:42,470 --> 00:20:40,799
voyage with you will be remembered by by

498
00:20:46,630 --> 00:20:42,480
all of us so thank you and good luck

499
00:20:54,870 --> 00:20:50,789
thank you very much

500
00:20:57,430 --> 00:20:54,880
thanks to all the students for the great

501
00:20:58,630 --> 00:20:57,440
questions um for the students that uh i

502
00:21:00,230 --> 00:20:58,640
didn't get chance to answer your

503
00:21:02,070 --> 00:21:00,240
questions i'll answer them in writing

504
00:21:04,070 --> 00:21:02,080
for you and

505
00:21:06,230 --> 00:21:04,080
thank you to let's talk science that's a

506
00:21:07,909 --> 00:21:06,240
really good organization in canada doing

507
00:21:10,470 --> 00:21:07,919
a lot of good work right across the

508
00:21:12,870 --> 00:21:10,480
country and we need to understand how

509
00:21:15,909 --> 00:21:12,880
things work to make canada a viable

510
00:21:18,470 --> 00:21:15,919
healthy economy and lex talk science

511
00:21:21,190 --> 00:21:18,480
really helps young canadians learn and

512
00:21:23,029 --> 00:21:21,200
figure out and invent how things work

513
00:21:24,630 --> 00:21:23,039
and and so thanks for doing that thanks

514
00:21:26,470 --> 00:21:24,640
for having me into your school today i

515
00:21:27,990 --> 00:21:26,480
wish everybody all the best and uh

516
00:21:36,390 --> 00:21:28,000
signing off from the international space

517
00:21:41,510 --> 00:21:38,149
station this is houston acr that

518
00:21:42,710 --> 00:21:41,520
concludes the event thank you

519
00:21:44,230 --> 00:21:42,720
thank you let's talk science

520
00:21:45,669 --> 00:21:44,240
participants stationed we are now