Astronomical terms

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