Astronomy I Vocabulary

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Across
  1. 1. the amount of light from a star that reaches Earth
  2. 5. complete spin on the axis (to rotate); Earth makes one every day (24 hours)
  3. 7. fixed, luminous point in the night sky
  4. 8. region separating inner & outer planets, where most asteroids are found
  5. 13. study of the universe & everything in it, such as the Sun, Moon, planets, stars, or galaxies
  6. 14. natural satellite that orbits a planet
  7. 15. tendency of a moving object to keep moving in a straight line
Down
  1. 2. complete trip around the Sun (to revolve); Earth completes one trip in 365¼ days (1 year)
  2. 3. star at the center of our solar system that supplies heat & light to Earth; its gravity keeps the solar system in orbit
  3. 4. group of stars making an imaginary shape in the night sky
  4. 6. path one object takes around another object
  5. 9. force of attraction, or pull, between any two objects
  6. 10. small, rocky bodies that orbit, or travel around, the sun
  7. 11. large object that orbits a star
  8. 12. system consists of the Sun and everything that orbits, or travels around, the Sun