Astronomical terms

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Across
  1. 2. a collection of billions of stars
  2. 4. the force of attraction
  3. 5. our closest star
  4. 7. the layers of gases that surround many planets and other bodies
  5. 9. pieces of rock or metal that orbit the sun
  6. 11. known as snowballs of the solar system
Down
  1. 1. a measurement of time
  2. 3. a person who travels and works in space
  3. 6. are satellites of planets
  4. 7. a spectacular light show
  5. 8. a round ball shape is called a sphere
  6. 10. the name given to a collision between two objects in space