Space Crossword

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Across
  1. 3. Everything that exists
  2. 4. A gigantic mass of stars
  3. 5. The kind of nuclear reaction which gives the sun its energy
  4. 8. The force that pulls on large objects
  5. 9. The tendency for an object to keep moving once it's in motion
  6. 10. An object which orbits another
Down
  1. 1. The result of momentum and gravity combined
  2. 2. About 70% of the sun
  3. 6. When the moon moves into the Earth's shadow
  4. 7. What the tilted axis gives us