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
Planets, Sun, and Moon
  1. The Sun: Our Home Star
  2. Mercury: The Iron Planet
  3. Venus: Our Twin Planet
  4. Earth: The Living Planet
  5. The Moon: Our Satellite
  6. Mars: The Red Planet
  7. Jupiter: The Massive Planet
  8. Saturn: The Ringed Planet
  9. Uranus: The Sideways Planet
  10. Neptune: The Blue Planet