Space words

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Across
  1. 2. It is spinning around the planet Tellus
  2. 3. Is hot but if you get close to it you die
  3. 4. Is big,round and looks like an gravel grain
  4. 6. We walk on it every day
  5. 7. Is blue and spins in the space
  6. 9. If you fly in it you won’t come back
Down
  1. 1. Occurs every 10th year
  2. 3. It often explodes when it's old
  3. 5. Is black and full of white/yellow darts
  4. 8. Is not a planet but can count as one