Black holes

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Across
  1. 3. of equal importance, rank, or degree
  2. 7. a straight line from the center to the
  3. 9. using or skilled in using analysis
  4. 12. a primary subtractive color for light
  5. 13. of a circle
  6. 14. a region of space resulting from the collapse of a star
Down
  1. 1. the line at which the sky and Earth appear to meet
  2. 2. a star that has collapsed under its own gravity
  3. 4. a subatomic particle with zero charge
  4. 5. the quality of being one of a kind
  5. 6. turn on or around an axis or a center
  6. 8. the four-dimensional coordinate system
  7. 10. the trace of a point whose direction of motion changes
  8. 11. a drawing intended to explain how something works
  9. 12. based on a decimal unit of measurement