Stellar Physics and Pioneers

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Across
  1. 5. - Type of star that results from core collapse of a massive star
  2. 7. - Danish astronomer who co-created the stellar classification diagram
  3. 9. - Indian physicist who calculated the white dwarf mass limit
  4. 10. - Quantum pressure that prevents white dwarfs from collapsing
  5. 11. - The technique of splitting starlight to reveal its chemical composition
  6. 12. - A star that periodically varies in brightness
  7. 13. - The visible surface layer of the Sun
Down
  1. 1. - The balance between outward radiation pressure and inward gravity
  2. 2. - The point of no return surrounding a black hole
  3. 3. - A protostar named after a Mexican astronomer
  4. 4. - A rotating neutron star emitting pulses of radiation
  5. 6. - Process that creates elements heavier than hydrogen in stars
  6. 8. - The layer below the photosphere where energy travels by radiation