star life

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Across
  1. 1. its the youngest stage of a star
  2. 4. a star that is very great intrinsic luminosity and relatively enormous size
  3. 5. this is the stellar core left behind after a dying star has exhausted its nuclear fuel and expelled its outer layers to form a planetary nebula.
  4. 7. a star that is not yet a because it is not hot enough
  5. 9. this is a place in space where gravity pulls so much that even light can not get out.
  6. 10. any star that has a hot, dense core which fuses hydrogen into helium to produce energy is this
Down
  1. 2. this is a very small cooled remnant of white dwarf that emits no detectable light.
  2. 3. a star that has exhausted the supply of hydrogen in its core and has begun thermonuclear fusion of hydrogen in a shell surrounding the core is this
  3. 6. this is formed when a massive star runs out of fuel and collapses.
  4. 8. this is the colossal explosion of a star.