Across
- 1. largest stars in the universe in terms of volume
- 8. collapsed core of a massive supergiant star
- 10. circular/elongated
- 11. a star that is larger than eight solar masses during its regular main sequence lifetime
- 14. a type of emission nebula consisting of an expanding, glowing shell of ionized gas ejected from red giant stars
- 15. barred spiral galaxy with diameter of about 220,000 ly
- 17. a radio galaxy, and one of the strongest radio sources in the sky.
Down
- 2. no shape
- 3. a stellar core remnant composed mostly of electron-degenerate matter
- 4. a luminous giant star of low or intermediate mass in a late phase of stellar evolution.
- 5. flat disk
- 6. a powerful and luminous stellar explosion
- 7. a disputed dwarf irregular galaxy in the Local Group
- 9. astronomical object held by gravity
- 11. a satellite galaxy of the Milky Way
- 12. a region of spacetime where gravity is so strong that nothing – no particles or even electromagnetic radiation such as light – can escape from it
- 13. what stars are made of
- 16. the galaxy that includes our Solar System
- 18. spends most of its time on the main sequence as an orange, yellow, or blue-white dwarf star.