SPACE

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Across
  1. 3. effect of big round things
  2. 4. round thing in front of other round thing
  3. 7. bunch of round things
  4. 9. tiny roundish thing
  5. 10. big round thing
Down
  1. 1. round the big round thing
  2. 2. little round thing
  3. 5. distance between round things
  4. 6. bigger brighter round thing
  5. 8. medium round thing