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[Music]

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by the time the hubble space telescope

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was nearing its 10th anniversary in

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space it had already become the gold

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standard for modern day astronomy

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hubble had grown into an indispensable

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tool used by scientists all around the

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globe to take an inside look into the

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universe around us

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everything was great flawless even until

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something unexpected started to creep

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its way into the picture

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in the last month namely in in november

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13th the fourth of six gyros that are on

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board hubble failed

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and that

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left only two operational gyros

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lights out hubble's gyros which are

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needed to accurately point the telescope

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were failing what was nasa supposed to

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do

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q servicing mission three a

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christmas discovery houston go outside

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[Music]

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by 1999 hubble was about to make its

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mark in the 21st century

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[Music]

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and as that turn of the century neared

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hubble was also due for another

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just like the previous two missions to

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hubble servicing mission 3 planned for

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the year 2000 was going to upgrade and

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refurbish the telescope

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what do you think about you putting your

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tether on

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however without warning hubble's

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gyroscopes began to fail over a year

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before servicing mission astronauts were

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scheduled to launch the gyros of course

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are are required for the science mission

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they're required for the extremely

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accurate pointing we've honed in onto a

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wire there that is broken and we think

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that is the reason why the gyros have

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failed

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so hubble needed three gyroscopes to

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continue to do science and by april 20th

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1999 that's all hubble had

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swiftly nasa declared a hubble emergency

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and split the upcoming servicing mission

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into two parts servicing mission 3a

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would mainly tackle the gyroscope

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failures and servicing mission 3b would

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encompass the rest of the maintenance

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that hubble didn't need right away

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it was now crunch time

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not only did nasa have to prepare an

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extra shuttle mission but the astronauts

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now had to go into overdrive to prepare

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for the upcoming mission now scheduled

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for october

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[Music]

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and then when everything seemed to be

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more under control news broke the fourth

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gyro failed today it's sitting up there

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with its

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self in safe mode

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and

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that again shows how important the

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serviceability is to this facility

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hubble was now in safe mode which meant

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that the telescope's eyes were

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temporarily closed to science

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the servicing mission was more critical

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and after multiple maintenance and

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wiring checks delayed the shuttle launch

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on december 19 1999 the team of

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servicing mission 3a was finally able to

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make their mark on history

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and liftoff of the space shuttle

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discovery on a mission to repair the

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hubble space telescope as we venture

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into the 21st century

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[Music]

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roger roll discovery

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houston is now controlling a real

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maneuver is complete discovery is now in

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a heads down position on course for a

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[Music]

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right away the team of seven astronauts

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went to work this eight-day mission

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included three spacewalks to hubble

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the first of which replaced all of the

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gyroscopes

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now hubble was able to be accurately

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positioned and stayed locked on to its

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celestial targets

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not only that the team behind servicing

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mission 3a refurbished hubble's fine

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guidance sensor for even greater

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precision in pointing the telescope

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fixed damaged thermal blankets that

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protect the electronics housed inside of

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hubble

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installed a new computer 20 times faster

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than hubble's original computer

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replaced old tape recorders with a new

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solid state recorder for a greater

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efficiency in hubble's data management

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and fixed the spacecraft's s-band

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transmitter to continue to relay data to

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the scientists on the ground

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and on christmas day 1999

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hubble was released back into the stars

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ready to uncover new discoveries that

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lie ahead

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servicing mission 3a proved that nasa

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could not only be quick on its feet in

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dire circumstances but perform as a team

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that is united around keeping our eyes

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open to the universe for many years to