Review crossword

12345678910
Across
  1. 2. a force that pulls objects to the Earth
  2. 4. a nearly complete circle; a hump
  3. 8. a massive ball of burning gas
  4. 9. these last forever on the moon because there is no atmosphere
  5. 10. growing
Down
  1. 1. the amount of stuff in an object
  2. 3. a half moon that is near the end of its lunar cycle
  3. 5. to circle a planet or star
  4. 6. when a huge star explodes
  5. 7. the first person to walk on the moon