The Space & Beyond Blog

Hazards to human spaceflight

Swollen heads, increased cancer risk, and inevitable bickering are just a few of the major hurdles astronauts venturing to other worlds will face.

an astronaut floating in the space shuttle with his hand over his eye

NASA astronaut Steve Swanson performs the Visual Acuity and Amsler Grid test aboard the International Space Station. Credit: NASA

a woman in a space suit floating in space and looking directly into the camera

NASA astronaut Christina Koch stops for a picture while replacing equipment on the International Space Station. Credit: NASA

An astronaut by a vehicle on a training mission

Analog missions, like the NASA one seen here, are an important way for researchers to study the complex behavior of people isolated in small groups for long periods of time. Credit: NASA

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