4. The atmosphere

5 images of cirrus clouds that are wispy or feather-like clouds at high level, made of ice crystals and may indicate an approaching storm

11 images that illustrate some daily weather conditions such as cold, hot and windy

15 images of various instruments such as rain gauges, wind vanes and weather satellites used to inform us about the weather

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.

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.

Did you know that too much carbon dioxide in the classroom can affect your body, and even your grades?

Learn how people came to understand the source of cosmic radiation, as well as how this radiation impacts those who work in and travel on airplanes.

Find out how asteroids, space debris, and cosmic radiation can be dangerous, and how to monitor them and protect ourselves from these space hazards.