Space

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Across
  1. 4. a large cloud of gas and dust from which solar system bodies formed
  2. 6. a planet-sized, very dense, collapsed star
  3. 7. a galaxy having the visible form of a spiral
  4. 9. the natural attraction between physical bodies
  5. 11. a small mass of ice, gas, rocks, and dust revolving around the sun
  6. 13. the apparent change in the position of an object resulting from the change in direction from which it is viewed
  7. 14. the luminous phenomenon observed when a meteroid is heated by entry into the earth's atmosphere
  8. 15. the complete range of frequencies of electromagnetic waves
  9. 16. a collapsed star of extremely high density composed of almost entirely neutrons
  10. 21. a rare, extremely bright nova
  11. 23. a unified body of matter
  12. 24. any of the millions of swirling clouds of dust and hydrogen gas that eventually evolve into thermonuclear stars
  13. 25. a star of low temperature but with great luminosity
Down
  1. 1. any of a number of celestial objects that emit immense amount of light and often radio waves
  2. 2. any of several celestial objects emitting periodic, short intense bursts of kinds of waves
  3. 3. any of numerous solar system bodies that revolve around the sun
  4. 5. a numerical measure of the brightness of a star or planet
  5. 8. the intrinsic brightness of a celestial body
  6. 10. a diagram that shows the relationship between a stars temperature and luminosity
  7. 12. a tendency to remain in a fixed condition without change
  8. 17. an apparent grouping of stars in the sky
  9. 18. a system of two stars bound together by gravity
  10. 19. a massive star in the last phase of its evolution
  11. 20. the brightest star in the sky
  12. 22. the act of liquefying or melting