space

123456
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. station a large structure in space where astronauts live and work while studying the universe.
  3. 4. the curved path an object takes as it moves around another object in space, like a moon around a planet.
  4. 6. the planet we live on, which has land, water, and air that supports life.