Stars and the Universe

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Across
  1. 1. Object consisting of a nucleus of ice and dust.
  2. 3. a glowing circle of light around an object.
  3. 6. a unit of astronomical distance.
  4. 8. Galaxy that includes the solar system.
  5. 9. a cloud of gas and dust in outer space, visible in the night sky.
Down
  1. 2. a plant that orbits a star outside the solar system.
  2. 4. a system of billions of stars, together with gas and dust.
  3. 5. collection of eight planets and their moons in orbit around the sun.
  4. 7. theory for how the universe began