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NASA astronaut Mike Hopkins takes an orbital selfie during extravehicular activity outside the space station in 2013. | NASA
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Where NASA Simulates Space to Train Astronauts: Photos

A bunch of astronauts dove underwater this week to simulate space. What other crazy places helps NASA learn how to live beyond Earth?

Published On 07/22/2015
12:35 PM EDT
An astronaut participates in egress training at the Neutral Buoyancy Laboratory in Houston. | NASA
European Space Agency astronaut Paolo Nespoli during CAVES in 2013. | ESA/V. Crobu
These Desert RATS team members look like they're standing on Mars. | NASA
An outside view of HERA, which is located at the Johnson Space Center in Houston. | NASA
NEEMO 15 crew members Zeb Scoville (left) and Mike Gernhardt working with human and machine capabilities to find specimens in the ocean. | NASA