Are Aliens Real?

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Across
  1. 1. The planet that had water and might have life is _______.
  2. 4. NASA uses a _______ to explore Mars.
  3. 6. Scientists study _______ from distant planets for signs of life.
  4. 7. _______ are planets outside our solar system.
  5. 8. Carl _______ said, “The universe is a big place. If it’s just us, it’s a waste of space.”
  6. 9. Aliens would most likely be _______ life forms.
Down
  1. 2. Scientists are trying to find out if _______ exist.
  2. 3. A planet needs _______ to support life.
  3. 5. Moons like Europa have large _______ under their icy surfaces.
  4. 10. Tiny organisms in Earth’s oceans are like _______ on other planets.