crossword puzzle

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Across
  1. 5. unit a unit of length effectively equal to the average a spiral curve, shape, or pattern
  2. 7. a unit of distance used in astronomy
  3. 9. Way is the galaxy that contains our solar system
Down
  1. 1. a close plane curve generated by a point
  2. 2. huge collection of gas, dust, and billions of stars and their solar system
  3. 3. is all of space and time and their contents
  4. 4. Bang the rapid expansion of matter from a state of extremely high density and temperature
  5. 6. year a unit of astronomical distance equivalent to the distance that lights travels in one year
  6. 8. system the collection of eight planets and their moons in orbit around there sun