Stars

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Across
  1. 3. The swollen, luminous stage of a star’s life when hydrogen burning shifts to a shell around the core.
  2. 7. Radiation left over from the Big Bang.
  3. 9. The heaviest element that can be formed inside stars by fusion
  4. 11. A dense, spherical collection of very old stars bound together by gravity, often found in a galaxy’s halo.
  5. 12. Stars on the left in the HR diagram are ... than the ones on the right
  6. 13. Stars on top of the HR diagram are ... than the ones at the bottom
  7. 14. Another of our neighbor galaxy
  8. 17. Stars here fuse hydrogen
  9. 20. The balance between gravity pulling inward and pressure pushing outward
  10. 21. One characteristic that determines how long a star will live
  11. 22. Plotted on the x axis of HR diagram
Down
  1. 1. Lies on the top right of the hr diagram
  2. 2. Object too small to sustain hydrogen fusion in its core.
  3. 4. Lies in the bottom left of HR diagram
  4. 5. Our Galaxy is a part of this
  5. 6. Plotted on the y axis of HR diagram
  6. 8. Shape of our galaxy
  7. 10. A glowing shell of gas ejected by a dying star, often surrounding a white dwarf.
  8. 15. Our Neighbor galaxy
  9. 16. The sudden onset of helium fusion in the core of a low-mass red giant.
  10. 18. The source of sun's energy
  11. 19. The compact stellar remnant left behind after a low- or medium-mass star exhausts its fuel.