galaxy gas

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Across
  1. 1. A star that experiences rapid brightness variation
  2. 4. The type of galaxy with a flat, disk-like structure
  3. 5. A star in the last stage of its life
  4. 8. A small, cold star near the end of its life
  5. 10. The remnant of a massive star after a supernova
  6. 11. The theory that describes the universe’s beginning
  7. 12. The observable boundary of the universe
  8. 13. The initial phase of star formation
Down
  1. 1. A system of stars bound by gravity
  2. 2. Our galaxy
  3. 3. The law that describes the relation between a galaxy's velocity and its distance
  4. 6. . A dense stellar remnant formed by collapsed neutrons
  5. 7. The force that governs the motion of planets and stars
  6. 9. The energy that causes the expansion of the universe
  7. 13. A rotating compact star emitting radio waves