Big Idea: Astronomy seeks to explain the origin and interactions of Earth and its solar system.

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.

In planetary science, astronomers have found planets that orbit other stars, just like Earth orbits the Sun. Some of them might even be able to support life.

8 images of different lunar phases showing the portion of the Moon lit by the Sun as the Moon orbits the Earth and as seen by us on Earth

This backgrounder explains what noise is, how it is measured, and how it affects our hearing, wellness and more.

This backgrounder explains what light is, how it is measured, and how it affects people on Earth and astronauts on board the International Space Station.

Humidity is an important part of life on Earth and life in space. This backgrounder explains what humidity is, how it is measured and how it affects us both mentally and physically.

Learn about how craters are formed and about some of Canada's impact craters.

This backgrounder explains the difference between planets, dwarf planets and small solar system bodies, such as asteroids and comets.

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

Why do a baseball and a rocket need the same launch speed to get from Earth into space? It has to do with physics and gravitational force.