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Across
  1. 1. Hole, A region of spacetime with extreme gravity.
  2. 5. Dwarf, The theoretical final state of a white dwarf.
  3. 7. The explosive death of a massive star.
  4. 8. Fusion, The process that powers stars.
  5. 9. Supergiant, An extremely large and luminous red star.
  6. 10. Dwarf, The dense core remnant of a star like the Sun.
  7. 11. Sequence, The stable phase of a star's life where it fuses hydrogen.
  8. 12. Giant, A star like our Sun after core hydrogen is exhausted.
  9. 13. A star in its earliest stage of formation.
Down
  1. 2. The rapid implosion of a massive star's core.
  2. 3. Star, A very dense star composed mainly of neutrons.
  3. 4. Nebula, A cloud of gas and dust where stars form.
  4. 6. Nebula, A glowing shell of gas ejected by a dying star.