What is out there?

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Across
  1. 2. some planets have these, our has one
  2. 6. this is our galaxy
  3. 7. what is out there?
  4. 10. this is a rock that flies through the sky
Down
  1. 1. when you see one in the sky, you make a wish
  2. 3. This has a tail and moves around the sun
  3. 4. This is a big group of stars
  4. 5. this has the sun as its center
  5. 8. some planets have these too, ours doesn’t
  6. 9. these are big spheres in the sky