Heat and Energy

Radiation shielding garment on the International Space Station

Radiation and Human Space Exploration

One of the greatest hazards that humans in space face is cosmic radiation. Learn what cosmic radiation is, why it's dangerous, and ways that we are looking at protecting humans in deep space.
International Space Station in the rays of the Sun

Temperature on Earth and on the ISS

Temperature is an important part of life on Earth and life in space. This backgrounder explains what temperature is, how it affects people and how it is controlled on the International Space Station.