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Solar System

Galaxies

Universe

The Ancients

Earth

Earth

Our home planet—is the only place we know of so far that’s inhabited by living things. It’s also the only planet in our solar system with liquid water on the surface.
Venus

Venus

Venus spins slowly in the opposite direction from most planets. A thick atmosphere traps heat in a runaway greenhouse effect, making it the hottest planet in our solar system.
Mercury

Mercury

The smallest planet in our solar system and closest to the Sun—is only slightly larger than Earth’s Moon. Mercury is the fastest planet, zipping around the Sun every 88 Earth days.