Astronomy

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Across
  1. 3. the closest star to earth
  2. 4. a star that suddenly increases in brightness
  3. 5. a frozen object with a tail that orbits the sun
  4. 6. A large group of stars, gas, and dust held together by gravity
  5. 7. the planet known as the red planet
  6. 9. the path one object takes around another
  7. 10. the phase when the moon is completely lit
Down
  1. 1. an imaginary pattern of stars in the sky.
  2. 2. the force that keeps planets in orbit
  3. 8. a natural satellite of a planet