Life Cycle of Stars and HR diagram

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Across
  1. 2. an interstellar cloud of dust, hydrogen, helium and other ionized gases, that is used to form stars
  2. 5. a series of star types to which most stars belong, represented on a Hertzsprung–Russell diagram as a continuous band, that goes from left to right
  3. 6. a star that unexpictedley increases greatly in brightness because of a catastrophic explosion that ejects most of its mass
  4. 8. a region of space having a gravitational field so intense that no matter or radiation can escape.
  5. 9. Astronomers use the HR diagram to either summarise the evolution of stars, or to look at the properties of stars.
Down
  1. 1. a very large star of high luminosity and low surface temperature
  2. 3. a star that forms from the explosions of other stars
  3. 4. a reaction when two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles
  4. 5. refers to the size or extent of something
  5. 7. a contracting mass of gas that shows an early stage in the formation of a star, before nucleosynthesis has begun