Life cycle of stars

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Across
  1. 2. sequence stars are fusing hydrogen into helium.
  2. 4. cycle of a star A smaller star
  3. 5. hole a place in space where gravity pulls so much that even light can not get out.
  4. 7. powerful and luminous explosion of a star.
  5. 9. a very young star that is still gathering mass from its parent molecular cloud
  6. 11. super giants stars with a supergiant luminosity class of spectral
  7. 12. distinct luminescent part of interstellar medium
Down
  1. 1. nebula the star sheds its outer layers.
  2. 3. star collapsed core of a massive supergiant star
  3. 5. dwarf a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently to no longer emit significant heat or light.
  4. 6. dwarf stellar core remnant composed mostly of electron-degenerate matter.
  5. 7. a natural luminous body visible in the sky especially at night
  6. 8. medium the tenuous gas and dust that fills the void between stellar systems in galaxies
  7. 10. giant a dying star in the final stages of stellar evolution
  8. 13. a state in which opposing forces or influences are balanced.