You Need Some Space!

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Across
  1. 3. Holds more than millions of stars
  2. 4. Force of attraction
  3. 6. Ancients myths
  4. 7. Fast celestial body that has a tail made of plasma
  5. 9. Houses the most moons in the solar system
  6. 10. Biggest source of X-Ray emmisions in the universe
  7. 12. The fastest speed in the universe
Down
  1. 1. Has only one moon
  2. 2. Rolls its way around the solar system
  3. 5. Closest Galaxy to ours
  4. 8. Falling towards a celestial body but never touching it
  5. 11. Has a light beam emitted from its north and south poles while spinning rapidly