HubbleSite
A Decade of Discovery HubbleSite
Telescope & Science
Investigating Space Photos
The Hubble Story Video
Simulating Weightlessness The Vault
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In preparation for servicing missions to Hubble, astronauts undergo extensive training. A huge underwater tank provides the closest training environment for weightlessness. During this training, the astronauts wear special underwater-pressurized suits similar to the suits worn on orbit. This 40-foot-deep tank contains full-scale underwater mockups of Hubble, the instruments being changed out and the carriers that hold the instruments. Astronauts spend many weeks in this underwater training, accompanied by weeks of classroom instruction.
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