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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 17,000 plus miles per hour in

orbit around the earth so it's not just pointing it's also moving as it points to stay on target.

So you need at least three gyros. It was a 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 years ago, they gave trouble

six new gyros all off the bat.

...