Space

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Across
  1. 2. half the size of the sun and they shine with less light
  2. 4. rapidly rotating neutron stars that blast out pulses of radiation
  3. 7. a spiral galaxy that contains our solar system
  4. 11. a group of stars that appear to form a pattern
  5. 13. a telescope that uses mirrors
  6. 16. when either the sun or the moon blocks each other
  7. 19. an object that has survived space travel to land on the earth.
  8. 21. an extreme amount of energy that may contain a supermassive black hole feeding on gas at the center of a distant
Down
  1. 1. a huge collection of dust, gas, stars and planets
  2. 3. daily
  3. 5. an area of such immense gravity that nothing, not even light, can escape
  4. 6. cosmic snowballs of frozen gas that orbit the sun
  5. 8. a doughnut shaped ring of icy objects around the sun
  6. 9. small bits of matter accumulate and combine with more bits of matter
  7. 10. everything
  8. 12. planets that orbit a star
  9. 14. a giant cloud of dust and gas in space
  10. 15. phases the phases the moon goes through
  11. 17. relating to the sky
  12. 18. is an object in space that entered Earth's atmosphere and burned up
  13. 20. a regular, repeating path that an object takes around an object.