Lilly Herr - Chapter 28/29

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Across
  1. 2. ________ is fused to helium by thermonuclear fusion in the Sun's core
  2. 4. the third planet from the sun
  3. 5. the closest planet to the sun
  4. 7. the intrinsic brightness, independent of how bright it appears
  5. 9. a stars _____ indicates it's temperature
  6. 10. the nearest star to earth
Down
  1. 1. the hot center of a nebula becomes a _________
  2. 3. a cloud of gas and dust
  3. 6. groups of stars that have regularly recognized positions
  4. 8. _____ planets are composed of high-density solid rock