Astronomy
Astronaut Training
Quick fact
NASA's Neutral Buoyancy Lab contains 6.2 million gallons of water where astronauts train for spacewalks using full-scale mock-ups of the space station.
Why this is interesting
Imagine floating in a vast, silent void, with Earth below you—but to get there, you must first endure months of training that push your body and mind to their limits. How does someone prepare for the most extreme environment known to humanity?