Space!

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Across
  1. 3. A bright hot large thing that planets orbit around
  2. 4. Astronauts explore this
  3. 5. An endless thing
  4. 7. Explorer of space
  5. 8. A transportation to go out of earth
Down
  1. 1. We usually see it at night
  2. 2. We are on one and there are 8 of them we know
  3. 3. You see them shining in the night sky
  4. 6. An unfounded creature
  5. 9. We live on this