A mysterious visitor

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Across
  1. 2. Weird
  2. 4. A scientist who studies stars
  3. 6. Travel in order to learn about it
  4. 7. The use of science and machines
  5. 8. Not thick
  6. 9. Perhaps
Down
  1. 1. Move past
  2. 2. It can be fast of slow
  3. 3. Traveling between stars
  4. 4. A rock drifting in space
  5. 5. Hit the surface noisily