Across
- 5. Rotational center of a huge galaxy like the Milky Way Galaxy.
- 7. Beginning point at which something begins.
- 9. Space and the matter space contains.
- 11. More than four solar masses squeezed into a ball
- 12. Mass of gas held together by its own gravity.
Down
- 1. Bands of dust that appear as dark ribbons.
- 2. Areas of stars that spread out from the center of a spiral galaxy
- 3. Large grouping of stars.
- 4. A theory that says the universe began as a small point that expanded rapidly.
- 6. Transfer of energy through matter or space as electromagnetic waves
- 8. Death of a large star by explosion.
- 10. Cloud of gas and dust in interstellar space.
- 12. composed mainly of hydrogen and helium.