Astronaut Mark Lee tests the new backpack called Simplified Aid for EVA Rescue (SAFER), a system designed for use in the event a crew member becomes untethered while conducting extravehicular activity. NASA

NASA Is Trying to Keep These Five Things From Killing Astronauts

These are the dangers that astronauts face, and here's what NASA is doing about them.

NASA astronaut Scott Kelly inside the Cupola, a special module on the ISS that offers a 360-degree view of the Earth. NASA/Scott Kelly
Astronaut Megan McArthur rests in her sleeping bag. NASA
NASA astronaut Peggy Whitson works on a science experiment in the Harmony module of the ISS. NASA
Astronaut Edwin E. "Buzz" Aldrin Jr. walks on the surface of the moon. National Museum of the U.S. Navy