life cycle of a star

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Across
  1. 2. stars that have burned up all of the hydrogen they once used as nuclear fuel.
  2. 3. large explosion that takes place at the end of a star's life cycle
  3. 6. an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars.
  4. 8. the smallest and coolest kind of star on the main sequence.
Down
  1. 1. a continuous and distinctive band of stars that appears on plots of stellar color versus brightness
  2. 4. a contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun.
  3. 5. hottest stars
  4. 7. dwarf a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently to no longer emit significant heat or light.
  5. 9. coolest stars