space

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Across
  1. 3. - A huge collection of gas, dust and billions of stars and their solar systems held together by gravity
  2. 6. - Small, rocky objects that orbit the Sun
  3. 8. - A person trained to travel in a spacecraft
  4. 10. - A place in space where the pull of gravity is so strong that even light can’t get out.
Down
  1. 1. - The main theory explaining how the universe started.
  2. 2. - A scientist who studies the universe
  3. 4. - The region between Mars and Jupiter that contains the largest population of asteroids in our solar system.
  4. 5. - A cloud of dust and gas in space.
  5. 7. - The planet we live on.
  6. 9. - The area of air and gas that envelopes Earth and other astronomical objects