earth

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Across
  1. 4. Hole: A region in space with such strong gravity that nothing, not even light, can escape
  2. 6. A small, rocky body that orbits the Sun.
  3. 7. A person trained to travel in a spacecraft.
  4. 9. The layer of gases that surrounds a planet, including Earth.
  5. 11. A giant ball of hot gas that emits light and heat.
  6. 12. A vast collection of stars, gas, and dust held together by gravity.
Down
  1. 1. A cloud of gas and dust in space.
  2. 2. A celestial body that orbits a star.
  3. 3. A celestial body made of ice, rock, and dust that orbits the Sun
  4. 5. The distance light travels in one year, used to measure interstellar distances.
  5. 8. A scientist who studies the universe
  6. 10. A pattern of stars in the sky.