Find and track the Sun, Moon, planets, and stars.

The Solar System
  1. What Is the Solar System?
  2. What Is a Planet?
  3. The Milky Way: Our Home Galaxy
  4. How Much Sunlight Reaches Other Planets?
  5. What Are Constellations?
  6. What Are Asterisms?
  7. What Is a Conjunction?
  8. How Do Gravity Assists Work?
  9. What Is the Ecliptic?
  10. What Are Sunspots?
  11. Astronomical Glossary
Illustration of Earth and Saturn with a ruler between them, representing measurement or distance in space.

Who’s Closest Right Now?

Play with our timeline to see the swings in the planets’ distances from Earth.
Illustration of the solar system showing planets in order from the Sun to Saturn.

Planet Sizes and Order

With surface gravity, moons, current phase, type, and more.