Are We Alone?

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Across
  1. 3. All living and existing things.
  2. 4. Any life outside of earth.
  3. 6. A celestial body moving around the earth.
  4. 7. A mysterious object seen in the sky by people.
  5. 8. A place outside earth that has lots of galaxies, planets, and stars.
  6. 10. A creature who is known to look like E.T.
  7. 11. A group of people who try to research new things.
  8. 15. To look for new things.
  9. 16. The action of communicating something.
  10. 17. To find or see first.
  11. 18. A radio wave received and transmitted.
Down
  1. 1. A huge piece of rock that flew from the atmosphere.
  2. 2. A instrument for viewing distant objects.
  3. 5. A scientist who studies planets and stars.
  4. 7. All existing matter in space.
  5. 9. To see something up high.
  6. 10. A layer of gas above the earth.
  7. 12. An astronomical-like object made of plasma.
  8. 13. Systems of billions of stars with gas, rocks, and gravity.
  9. 14. Something that moves.