Life of a star

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Across
  1. 2. is a dying star in the last stages of stellar evolution
  2. 4. is a powerful and luminous stellar explosion
  3. 8. is an interstellar cloud of dust, hydrogen, helium and other ionized gases
  4. 10. is a hot star with a luminosity class of III or II
  5. 11. a small very dense star that is typically the size of a planet
  6. 12. are the smallest, coolest and dimmest Main Sequence stars and orange, red or brown in colour
  7. 13. is any star that is fusing hydrogen in its core and has a stable balance of outward pressure from core nuclear fusion and gravitational forces pushing inward
  8. 15. is a theoretical stellar remnant, specifically a white dwarf that has cooled sufficiently that it no longer emits significant heat or light
Down
  1. 1. no particles or even electromagnetic radiation such as light—can escape from it
  2. 3. Stars are born within the clouds of dust and scattered throughout most galaxies
  3. 5. is the collapsed core of a giant star which before collapse had a total mass of between 10 and 29 solar masses
  4. 6. are among the most massive and most luminous stars
  5. 7. is the combining together of two lighter nuclei to form a heavier one
  6. 9. go through a similar process to low mass stars in the beginning, except that it all happens much faster
  7. 14. a contracting mass of gas which represents an early stage in the formation of a star, before nucleosynthesis has begun