Third planet from the Sun. The only world known to harbor life. A dynamic planet of oceans, continents, and a protective atmosphere.
Earth is the only planet with liquid water on its surface and the only one known to support life. Its atmosphere protects us from radiation while keeping temperatures just right.
Earth has four main layers: a solid inner core of iron, a liquid outer core, a thick mantle of hot rock, and a thin crust we live on.
The Moon is Earth's only natural satellite — the fifth largest in the solar system. It stabilizes our axis, creates tides, and makes Earth more habitable.
Earth is home to millions of species — from deep-sea microbes to towering trees. Life exists in nearly every environment, from frozen poles to boiling vents.
Earth's magnetic field deflects harmful solar radiation. Without it, our atmosphere would be stripped away like Mars — and life as we know it couldn't exist.