Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 2. atmosphere area 4. astronomical instrument 5. a science which studies phenomena in the universe 6. linked with the moon 7. are bright in the sky 8. maximal distance

Down: 1. an adjective for "a hundred years" 3. minimal distance 5. is ring-shaped 7. you are protected