Space and the Origin of the Universe

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Across
  1. 2. A celestial body that generates its own light and heat.
  2. 4. A naturally made object outside the Earth's atmosphere.
  3. 6. A celestial body that orbits a star.
  4. 7. All planets in our solar system orbit this star.
Down
  1. 1. A large system of stars held together by their gravity.
  2. 2. An object orbiting a celestial body of large mass.
  3. 3. A natural satellite of a planet.
  4. 5. Group of planets, asteroids and other celestial bodies that are in orbit around a star