Alien

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Across
  1. 1. The "Red Planet" (4 letters)
  2. 5. Celestial object with a glowing tail (5 letters)
  3. 6. Human who travels to space (9 letters)
  4. 8. Another word for "extraterrestrial" (5 letters)
Down
  1. 2. Claimed alien kidnapping (9 letters)
  2. 3. A device to observe distant space objects (9 letters)
  3. 4. flying object often linked to aliens (3 letters)
  4. 7. Vast system of stars and planets (6 letters)