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station this is issa

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he's aztec

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this is the international space station

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thank you paulo you are now connected

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with the students in toulouse cologne

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frascotti and lisbon please begin the

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station for the epo greenhouse

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experiment that involves us here in

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space but also down there because you

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guys are going to help us today in

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trying to figure out something about

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going in space growing uh exploring

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continuing our exploration we're gonna

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uh

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do together something to verify that if

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if we can actually put

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plants in space to grow things that we

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can eat

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and important to have them germinate

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have seeds and try to reseed them again

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this is something that

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not clear yet and we want to see how

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this

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microgravity environment radiation

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environment different environment does

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to this plant

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so we have here a mini greenhouse it's

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already set up here in a in a corner but

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we will now get a work and make sure

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that the the greenhouse the experiment

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starts so i'm going to start by putting

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on some glass because we don't want to

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contaminate the plants nor then to

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contaminate us here in space you're on

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the ground when you will do your

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experiment you will not need to do this

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and and then we work together we'll put

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some water into the the chamber and

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okay this is the setup that we have uh

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here

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we have a mini chamber containing

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a growth medium which is a big term for

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some

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we have a pillow that contains the plant

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so the plants can be isolated and if the

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plants will lose something it doesn't

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float around here in space as you see

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everything flows so you you really need

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to be careful otherwise you lose

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everything

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attached to this growth chamber we have

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a syringe and a little reservoir with

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water so what i'm going to do now i'm

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going to take a measured

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quantity of water a specified quantity

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of water from the reservoir put it into

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the syringe and then with the syringe uh

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put the water into the gross medium i'm

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going to take about 50 milliliters the

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total amount that we'll put there is

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going to be about 210 milliliters

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uh and you will do the same so as you

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see it's growing apply something simple

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but but we're not trying to make it

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complicated by doing all these

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measurements but we we are trying to

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make out of this little thing a

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scientific experiment and you can do a

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lot of things a lot of observation you

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can help us if you really look at what

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you're doing and make sure that you

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understand what you do and you do it

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carefully so let's go ahead and put some

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and now carefully i'm pushing the water

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into the growth chamber we don't want to

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go too fast because the water may spill

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uh or it may blood chamber we want to

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make sure that

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we put enough force to get the water in

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there but slowly so the the

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growth pinion medium the the earth

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uh the dirt that is inside there get wet

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homogeneously without creating a spot

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and here we are we have about a half of

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and when uh but i'm going to be done

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here

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we'll wait uh a minute to let the water

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expand inside but then we will actually

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drain

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the excess water if there is any just to

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make sure that we don't leave water

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inside and floating around this can pose

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especially here in space

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some mold some growth

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something inside that we don't want

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so we will drain the excess water

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so here we go

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i'm now complete with the 15 millimeters

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i'm going to remove the clean water

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supply water reservoir and put a waste

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water bag on it

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as you can see a little bit of water

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came out not too much which means that

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all the water has been uh

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the vast majority of the water has been

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absorbed by the growth medium medium

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we also have a measure of amount how

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much water

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given there and this is also important

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to know so at this point we can

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disconnect

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this uh

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system for watering we will be watering

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frequently in order to maintain the root

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wet

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and and then we will actually

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remove

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and prepare the upper part to let the

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plant

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so inside the chamber we have seven

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plugs

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which correspond to the areas where the

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seeds have been planted i'm going to

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remove those flags plugs in order to

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leave the

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very good the plaques have been removed

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it's now free to grow we will close the

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chamber and put it up in our corner in

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our little corner that we have set up

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where there is a light we have a control

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temperature temperature environment so

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we make sure that there is enough light

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a good temperature enough water for the

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plants to grow and we will initiate our

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measurements the same way you will do on

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earth and then we will compare i will

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take pictures video and you will do the

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same and we'll post them and compare our

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as you can see in our corner there we

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have two chambers

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one has a seed of lettuce and the other

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one the one we just initiated now

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contains arabidopsis which is a plan

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that has been has a very non-genetical

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buildup so we can actually know what is

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doing and it's very well known very used

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in biology so here is our setup and and

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so we can declare the experiment

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initiated i'm looking forward the plants

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grow maybe we'll eat some salad here we

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have some fresh food here in station

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it's not going to be enough for us to

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actually

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eat and survive on that but for the

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future generation for the future

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restaurants going to mars going

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even beyond that this will be a very

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important so all together today we're

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doing a very important step and we're

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also having fun so let's uh go ahead

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with your questions

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toulouse

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hello my name is

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i have a question how is oxygen

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the oxygen on the space station

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is um

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is generated by breaking down water uh

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we actually have water and especially

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waste water we have a special equipment

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here that breaks it down and discharge

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we discharge the nitrogen but we keep

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the oxygen and we

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breathe it in this way we have a very

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interesting system here on station

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because we have to recycle everything we

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cannot throw away stuff or at least we

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try to throw away the absolutely minimum

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and oxygen is one of the resources that

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we need to maintain and be careful on

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cologne your question please

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hello my name is clara and my question

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is how does the water get through the

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hey sarah the the water how the water

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gets the plant well the water is

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distributed inside this growth medium

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and and uh

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it gets homogeneously distributed in in

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there plants actually have roots and and

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the roots fix the water

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so is actually the plate looking for the

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water more than the water looking for

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the plant and this is also one aspect

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that we are actually looking into it

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verifying if the fact that there is no

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more gravity

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uh how this this fact changes the way

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the roots go down on the growth medium

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scotty your question please your

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question please

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hello

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my name is flavia and my question is

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what happens if the author of the suit

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is them is doing

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the external activity from

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the

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iss

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and how much time have you got to return

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really make sure that everything outside

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the station doesn't have any any surface

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or any anything that could cut

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or provide or give us put us in danger

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so this is very well uh carefully

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checked and make sure that this doesn't

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happen but in case this would happen it

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depends of the size of the hole and how

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much

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air will actually escape from the suit

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we have a special

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container pressurized uh tank in our uh

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ea spacewalk the suit and in case of an

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emergency this tank is actually

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activated and can provide us for

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about 30 minutes of additional air

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to pressurize our suits and this should

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be enough for us to rush back to airlock

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close the airlock and pressurize it

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lisbon your question please

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hello my name is simel and my question

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is how many times do we have day and

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night and how do we deal with it on the

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it's a very interesting question because

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we use

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the title of the sun and the night day

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and night to to actually pet ourselves

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and actually set our working day in our

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rest

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time well here on stage we are orbiting

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around the earth at 28 000 kilometers

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per hour that's about seven kilometers

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per second and which means that every

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hour and a half we actually go around

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the earth and and we are uh for about i

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would say 45 minutes 50 minutes to an

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hour on the sun side but oh half an hour

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more or less in the other side of the

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earth so which means we are shielded

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from the sun so

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at the end if you really counted we we

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have 16 sunset and 16 sunrises per day

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which confuses us and but of course we

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are not looking outside the window all

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the time we're actually checking our

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watch we use

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the greenwich mean time which is the

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time of london the universal time and we

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go by that and we make sure that we

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don't look outside the window if we if

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if we want to know if it's time to sleep

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to lose we have time for another

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hi my name is jenny and my question is

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how do you communicate with your loved

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yes uh that's uh that's obviously it's

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very important for us to be in touch

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from the ground and uh

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first we will talk to our mission

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control center and make sure that we get

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all the work and they follow us what we

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are doing

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but second also have a little bit of

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time off and make sure we talk to our

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family's friends

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we do have here on board the possibility

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of using

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what is called an ip phone which is a

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kind of internet phone

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and we can actually talk when the saddle

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is available when the link is available

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i can actually call uh

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essentially any phone on earth

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also periodically about once a week we

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have a 10 minutes or 15 minutes slot in

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which a video conference is set up and

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we can actually talk to our families i i

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talk to my wife sasha and to my daughter

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sophia and it's very nice them talk to

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them and make sure that they don't feel

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we have time for one last question

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hello my name is patrick and my question

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i'm sorry i i missed it say it again

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my name is patrick and my question is

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understand correctly how do you pour

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water yes yes well obviously

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here in the uss you cannot pour water

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because water doesn't go down we have

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this drinks bag that i like our cup so

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they are completely closed the water is

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inside they have a special straw with a

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kind of a

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tap in there because we need to close it

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if we don't would not close the

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attack this is what happens which means

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water is going all over the place and of

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course

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we don't want it to go

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experiment and to the equipment and

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we keep it contained all the time it's

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very interesting and it's fun to play

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we hear we're near the end of our time

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we would like to thank you so much for

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the greenhouse demonstration today and

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for taking our questions

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if you would say goodbye to the audience

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yes uh thank you everybody for uh being

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up here in space with me and my other

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fellow astronauts and they are on board

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on the international space station i'm

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pretty sure that you when you grow up

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will have possibility to go into space

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space probably continue exploration will

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continue thank you for helping us in

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following this experiment doing yours

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observations compare them with us and

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help us help all of us in understanding

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better what happens so

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thank you to everybody

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your participation here and we are

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looking forward to

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see you on

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the internet and see you when i come

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back we will do another of this section

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and compare the results

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station this is houston acr that

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and thank you

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s tech station we're now re use the

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station uh thank you i appreciate