Let's find 'space' related words

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Across
  1. 5. A kind of alien life that lives on Mars
  2. 6. we should try and ___ aliens
  3. 7. big space that consists of all the stars and planets
  4. 8. do aliens look like ___
  5. 10. the study of planets
Down
  1. 1. you can see things far away with this
  2. 2. Earth is a ___; Jupiter is too
  3. 3. will scientists ever ___ life on other planets
  4. 4. aliens are smart and ___
  5. 9. large and round, could be an alien spaceship