space

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Across
  1. 2. a person trained to travel and work in space, often conducting research or operating spacecraft.
  2. 5. a test done to learn more about something or to see if a theory is correct.
Down
  1. 1. the force that pulls objects toward each other, keeping us grounded on the surface of our planet.
  2. 3. the area that is not filled with anything, often referring to the vastness outside of Earth or the empty room around objects.
  3. 4. the curved path an object takes as it moves around another object in space, like a moon around a planet.
  4. 5. the planet we live on, which has land, water, and air that supports life.