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