Across
- 4. A bright emission nebula in the constellation Perseus, named for its shape, which resembles the state of California.
- 5. A bright emission nebula in the constellation Orion, known for its fiery appearance and the intense star formation occurring within it.
- 8. A massive star-forming nebula in the Large Magellanic Cloud, named for its resemblance to a spider's web.
- 11. A planetary nebula in the constellation Centaurus, named for its unique shape resembling a lemon slice, created by the outer layers of a dying star.
- 15. A unique nebula in the constellation Monoceros, known for its unusual rectangular shape, formed by the interaction of a star's intense radiation with surrounding dust.
- 18. A famous structure within the Eagle Nebula, consisting of massive columns of gas and dust, where new stars are forming.
- 19. A large planetary nebula in the constellation Aquarius, often referred to as the "Eye of God" due to its circular shape.
- 20. A bright emission nebula located in the constellation Orion, known for being a stellar nursery where new stars are born.
- 21. A large, intricate remnant of a supernova in the constellation Cygnus, with delicate filaments of gas and dust.
Down
- 1. A dark nebula in the constellation Orion, shaped like a horse's head and located near a bright star called Alnitak.
- 2. A supernova remnant in the constellation Taurus, formed from a star that exploded in 1054, now a source of intense radiation.
- 3. A planetary nebula located in the constellation Centaurus, famous for its unique hourglass shape and extremely low temperature.
- 6. A planetary nebula in the constellation Draco, known for its striking and complex shape, resembling a cat's eye.
- 7. A large emission nebula in the constellation Sagittarius, home to active star formation and visible with the naked eye.
- 9. A planetary nebula in the constellation Gemini, named for its appearance, which resembles an eskimo wearing a fur-lined hood, formed by a dying star surrounded by a glowing gas shell.
- 10. A bright emission nebula in the constellation Cassiopeia, shaped like a bubble due to stellar winds from a young, massive star pushing gas and dust outward.
- 12. A star-forming region in the constellation Serpens, famous for the "Pillars of Creation," large gas and dust columns.
- 13. A planetary nebula in the constellation Scorpius, shaped like a butterfly with two distinct lobes of gas.
- 14. A massive star-forming region in the constellation Carina, home to some of the most massive stars known, including the hypergiant star Eta Carinae.
- 15. A planetary nebula in the constellation Lyra, featuring a bright, circular structure created by a dying star.
- 16. A planetary nebula in the constellation Vulpecula, shaped like a dumbbell, formed by a dying star shedding its outer layers.
- 17. A nebula in the constellation Sagittarius, known for its distinctive "trifid" appearance, with three bright lobes of gas and dust.