Why did NASA decide to reentry the spacecraft for safety reasons?
The Associate Administrator stated that if another gyroscope failed, the spacecraft would pose an unacceptable risk to human life. “You might ask, what is the probability that we lose that gyro and go out of control or out of, not have the capability to bring down CGRO. There is a 10% chance that we could lose that gyro over the next three years. If CGRO reenters on its own, without control, there is a 1 in 1000 chance of a human fatality. That’s fatality. That would be the case where we didn’t do anything and let it come down by itself.
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