What Makes a Planet Habitable or Not?

A planet needs the right temperature to be habitable. Imagine Earth as a cozy room, if it were too hot like Venus, or too cold like Mars, we wouldn’t be able to live there.

Planets that are just right in distance from their star have a good chance of being habitable. This is sometimes called the Goldilocks Zone, not too hot, not too cold, just right for water and life to exist.

If a planet has no atmosphere or the wrong kind of air, it can't hold onto its warmth or liquid water, like how Earth would be frozen if we had no blanket of air around us.