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you are currently looking at a view of

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the space telescope operations control

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center also known as the stock located

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at nasa's goddard space flight center in

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greenbelt maryland

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the astronauts aboard space shuttle

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atlantis along with ground teams of

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flight controllers at johnson space

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center houston and here at goddard had a

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challenging but ultimately very

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satisfying day as the two main

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objectives for the second spacewalk of

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the mission were both accomplished

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we spoke with mission operations manager

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keith wallis just after he stepped off

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console to get his views on both the

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issues his team had to work as well as

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the significant accomplishments of

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flight day five

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so today was our second spacewalk day we

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called it eva2 the extra vehicular

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activity it was a challenging day

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we started off on a euphoric note that

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first rc the first two drivers they went

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in no problem and we're really happy

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about everything was going great and

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then the challenges started it was tough

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the crew tried to get it in they

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couldn't get in they tried different

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methods it was impressive how well they

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were working getting this done but it

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still wasn't happening and there was a

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sense of concern in the stock and you

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definitely have some nervousness however

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having said that we also know

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how well this crew does oh look at the

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great job they did yesterday with

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winefield camera so yeah it was

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definitely some tough feelings but we

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never lost faith that they were going to

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get it done and they did and they

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absolutely did a fantastic job we tested

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it out we did that aliveness test to see

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to make sure everything turns on right

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heaters come on perfect everything's

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looking very very good with them and

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then finally the batteries so we went on

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to the battery test and we actually

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thought that was going to be a little

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more challenging turned out to be no

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problem the crew took care of that

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very they made it look easy it worked

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wonderfully we've done our liveness test

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and our functional tests and those are

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working great so our first three

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batteries are changed out

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everything today despite the challenges

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was a fantastic success

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tomorrow we have a very long day of

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working on the advanced camera for

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surveys and cause camera and they did

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the small get-ahead task and it was a

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get ahead test today where they had to

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route some cables and connect uh the

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cable together to provide power to this

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new

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for surveys and they could access them

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more easily from the door that they're

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in today they did it tomorrow they'd

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have to literally bend over backwards to

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get to that cable they did it today and

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work fine so that's going to save us

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time tomorrow and that's important

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because tomorrow is going to be a really

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long day the two activities we have

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tomorrow

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we're going to take out the original

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corrective optics which is installed

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back in 1993 and put in a new

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spectrograph when i say a camera or

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spectrograph it's not a small camera

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like you see at a store it's about the

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size refrigerator and the astronauts are

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going to change that out if we take out

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this old corrective optics from this new

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cosmic origin spectrograph

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then the real challenging task happens

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afterwards

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we have one of our

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most famous cameras our advanced camera

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for surveys which really takes some of

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the best pictures you've seen so far

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well unfortunately about two years ago

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this camera failed it had an electrical

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problem on board and this is a camera we

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just installed in 2002 well the

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astronauts are actually going in and

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repairing it

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so they're going to go inside get into

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the guts of it and they're going to take

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out some of the boards that aren't

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working and put in new ones and after

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that they're going to button it all up

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again and it should work fine it's going

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to take a little longer to do on this

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day and we've looked and if everything

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is going according to schedule it'll be

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a longer space walk than what we do on a

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normal basis and that's one of the

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reasons for that get ahead test today

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anything we can do ahead of time to make

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it easier in fact those

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latch over center kits those door

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latches we put on the first day those

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are get a head test for this also so

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anything we can do we try to get this

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done ahead of time so that tomorrow we

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hope everything will go as smoothly as

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saturday spacewalk will see the

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installation of kos with the cosmic

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origin spectrograph the second new

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science instrument being added to hubble

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cause is the most sensitive

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spectroscope

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are

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so important for research

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they produce ugly pictures

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but

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they are the nuts and bolts of physical

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science

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they put the physics in astrophysics

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cos was conceived in the mid-1990s by dr

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jim green and his colleagues at the

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university of colorado primarily to

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study the cosmic web which is made up of

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the largest scale structures of matter

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if you want to know what something is

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made of how hot it is how dense it is

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how fast it's moving in space how fast

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it's rotating for example a spectrograph

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will give you all that information with

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cost we can acquire information like

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that

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farther out across the universe than

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spectroscopy is

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taking light from an object

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and breaking it up into

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the different colors that that light

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consists of

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each of the elements each of the

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chemical elements has

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characteristic wavelengths

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characteristic colors at which it emits

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light when you heat it up or absorbs

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light

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for example if i have a

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a tube full of hydrogen between

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me and that light instead of seeing the

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normal spectrum of that light when i

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look at it with the spectrograph i'll

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see that spectrum but with some of the

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light taken away at the wavelengths

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where hydrogen has its characteristic

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absorptions

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and so by measuring that the depth of

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those notches and the velocities and the

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width of them and so on you can infer

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all kinds of things about the physical

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state of that cloud

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kos has taken a really key part of

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spectroscopic science and said how can

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we do that in the absolutely best most

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efficient way

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and that is

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to measure

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the properties of the material between

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the galaxies looking back into the

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universe

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as the galaxies form there's a lot of

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material that does not collapse into the

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galaxies and there's other material that

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is ejected from galaxies by supernova

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explosions and so on and so that

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intergalactic gas the so-called

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intergalactic medium

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carries a lot of information about the

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history of the universe

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when you couple that story sort of the

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global cosmic process of how you form

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the large-scale structure of of how

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material is distributed in the universe

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and what role that played in forming new

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galaxies and then you use wifi camera

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three to investigate

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how did the galaxies themselves change

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internally with time

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and over space you know looking back

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through the history of the universe all

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that kind of ties together

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into the full story

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it's going into the costar

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slot

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and so there is nothing whatsoever lost

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in doing that because costar is not

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needed anymore costar was put up in the

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first servicing mission and it was used

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to deploy correcting optics in front of

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some of the first generation instruments

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the the first generation spectrographs

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for example correcting optics to correct

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for the spherical aberration that had

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been inadvertently built into the hst

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primary mirror

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all the more recent instruments include

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that correction within the new

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instrument itself so right now costar

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doesn't have anything to do all the

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other instruments in the so-called axial

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bays of hst have their own internal

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correction and so the costar space is

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freely available and they'll pull that

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out at no loss of science to hst

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whatsoever and replace it with this

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the other major activity during the

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third spacewalk of the mission is an

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activity that has never been attempted

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before

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getting access to and making repairs to

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specific components of a non-working

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science instrument in this case the

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advanced camera for surveys or acs

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we are going to add a shuttle servicing

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mission to the hubble space telescope to

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the shuttles manifest to be flown before

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about 7 35 eastern standard time

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hubble entered into inertial hole safe

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modes we noticed spikes on the structure

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current and the main bus current we

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believe that this is indicative of a

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short circuit that occurred in the

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acs was inserted on hubble in 2002

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before it died it was the most heavily

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used instrument on hubble acs was our

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best survey camera so it was able to

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for example map the distribution of dark

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matter and space no one had ever done

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that before

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acs was critical to our study of dark

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energy surveying the

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the galaxies out across space for

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exploding stars supernovae that would

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indicate how far away those galaxies

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were and how fast they're moving away

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so we were pretty far along on stis

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and then acs failed and that was really

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late in the game

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what failed as a power supply and in

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fact in the acs there were two power

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supplies one

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redundant set of power supplies so one

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of them failed and they switched to the

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other side and the other one then failed

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so there was not much time but it was

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decided to see if we could come up with

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a fix for it

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we leveraged what we learned on this

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disk job you know how to get to those

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components how to remove large numbers

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of fasteners with fastener capture

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plates how to build special tools for

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the astronauts to do the job

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just getting the thing to work in this

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amount of time

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has been difficult we're running

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probably two to three times faster than

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a typical program getting things from

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concept to design to actual

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cutting metal and building things

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it has become one of the fortes of our

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program

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that our people are really really good

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removing the card the the cards that

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we're taking out are very similar to the

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card that's being removed in this disc

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repair and in this disk repair they are

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going into where the power supply is

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because that was also a power supply

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failure

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so they're taking off 111 screws for

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stis and it's

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32 for us

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we had learned an awful lot on stis we

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knew how to get to these places we knew

294
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how to pull covers off we knew how to

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pull cards out now the problem was could

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we do it where acs

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these instruments were never designed to

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be opened up

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by astronauts in space and certainly not

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by astronauts in space working in big

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bulky spacesuits

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so we needed to make sure that what we

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were doing was something that could be

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done by an astronaut in zero gravity

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with this big puffy suit around them

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constraining their movements and not

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only that but it's inside what's called

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the aft shroud of the hubble space

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telescope so there's the space is kind

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of confined they have these doors that

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they open up and can get in

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but where we're actually going in is

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kind of they kind of have to reach

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around

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some of the stuff

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and not work right in front of their

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faces

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the primary detector of the acs what's

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known as the wide field channel is a ccd

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just like in your digital camera

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only it's

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16 megapixels so there's a box that

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controls that the ceb and that's what

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we're taking out and it's probably fine

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it actually is probably still working

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but that's the easiest way to get in and

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get new power into the system

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we had to design a

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plate that goes on top of where we're

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taking off the screws sort of clips on

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there and has little holes in them for

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the screwdriver to go through the bit

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and

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those are too small for the screws to

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pass through and that was designed for

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the stis repair

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and they had a very large one with lots

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of different types of screws and we were

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fortunate that we are in the end only

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taking out one size of screw

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work we're going in through the top of

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this box and there are four circuit

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cards in there we'll pull those out and

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that leaves us a hole with connectors at

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the bottom and those connectors are what

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connect to the detector and what used to

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supply power to it

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and then we'll have a little cartridge

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with four new cards in it that will

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slide into that space

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and that will

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allow us to make connections there with

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the new cards

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but also the power now will come in from

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the outside through our external power

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supply

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it's particularly important to repair

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acs

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because it together with the new camera

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the whitefield camera 3 make a

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complimentary set they have a full set

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of capabilities that astronomers need in

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cameras operating together it's very

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clear

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that after the servicing mission is over

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astronomers will be using this

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combination of wide field camera 3 and

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advanced camera for surveys about

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so recapping the activities for flight

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day five the spacewalk completed by mike

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massimino and mike good was the second

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of the flight and the 20th in the

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history of hubble service emissions

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on deck for tomorrow installing a new

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instrument that will help put more

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muscle in the physics of astrophysics

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and an unprecedented on-orbit repair

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we will now return to mission control in

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houston for continuing nasa television

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coverage of the flight of atlantis on

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the sts-125 mission

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up next on nasa tv will be the first