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This is John Batcheter. conversation with my good friend Bob Zimmerman about

Hubble, the madly successful NASA robot now aging. Three gyros left. Bob explains what can be done with three gyros two gyros one gyro as the

Hubblecraft ages and cannot be repaired Many repair jobs have brought it to this state, but

gyros move and as Bob explains, when you move you wear out.

Yes, John, Hubble was originally given six gyroscopes.

Now to get, the gyroscopes basically help point the telescope and you want three

because that gives you pointing directions in three directions three

dimensions so if you have three drivers working you can point the telescope

with extreme position of course that's what Hubble needs because it's looking at

very tiny objects that are very faint and very far away

so it's got to be able to point really accurately and remember it's moving

seventeen thousand plus miles per hour in orbit around the earth so it's not just pointing it's also moving as it

points stay on target so you need at least three gyros it was given six originally

when it was launched those gyros have been replaced multiple times during the many

maintenance missions during the last maintenance mission in 09 which is now what 14

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