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all right tool time take 126.

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[Music]

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hi i'm john grunsfeld nasa astronaut

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hello i'm russ wordiff

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i was the eva manager for hubble space

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telescope from goddard

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now eva is an acronym for extra

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vehicular activity which is just a

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really long way of saying spacewalk

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i'm wearing some spacewalk gloves i

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noticed that to talk about spacewalking

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on the hubble space telescope now the

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hubble space telescope we all know it's

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that amazing observatory in space that

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helps us unravel the mysteries of the

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universe

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but when hubble was first launched in

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1990 we discovered the mir was a

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slightly incorrect shape and so the

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images were fuzzy and that's

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slight incorrect

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problem with the mirror was

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around the outside edges it was 1 50th

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the diameter of a piece of human hair

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too flat

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but it was enough that we couldn't do

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the science we had base optics yes

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so in 1993 a crew of women and men went

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up to do five space walks to change out

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one of the scientific instruments

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with the corrective optic space

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telescope axial replacement or co-star

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which corrected that optics

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in order to take that instrument out

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they had to use a power tool now one

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thing i'd like to say about hubble space

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telescope is that

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it was

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designed engineered originally quite

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uniquely to be take a particle

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not a real word

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but

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that means and i think everybody

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understands

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that a scientific instrument or a solar

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array could be taken off and replaced

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in case

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something had gone wrong with it

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or it needed repair

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and

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guess what we get new technology all the

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time the designers put in standardized

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bolts and interfaces this means

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connectors the bolts and even doors on

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the telescope that opened and closed and

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they had those doors had bolts on them

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and this tool was one of the tools used

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to help undo the bolts of the

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instruments of the doors it's called the

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power ratchet tool

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this this was the initial

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power tool that we used as john said on

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our first search servicing mission back

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in 1993.

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it's doesn't weigh much in space

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floats floats in space

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but it is kind of bulky

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so in tool development in the future we

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came up with other power tools but at

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the time this was the tool of choice

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that we use for the tasks that we had on

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that very first servicing mission and so

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this was used with an extension on it

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and a socket to turn bolts so when you

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pull the trigger

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electricity would flow from the battery

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through this long cable to the motor

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and turn the bolt and you could turn it

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clockwise or counter clockwise it could

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also be used manually in case a bolt was

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stuck just like a big torque wrench on

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the ground which means

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you know using your muscles to crank the

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bolt in case it was stuck right we have

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to consider a lot of things

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and

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it has to be operational it has to be

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used with those big old gloves

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and

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use in space with no sharp edges

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to puncture those gloves or your suit

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and each time we went up to the

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telescope as russ said we would bring

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new scientific instruments new

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electronics and the net effect

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is that we reinvented the telescope and

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made a new observatory each time we went

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to space allowed hubble to help us

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unravel the mysteries of the universe

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thanks russ okay thanks john

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there's a tear in the glove christy

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all right there's probably a few there