Marvelous Milky Way

3. I look like the head of a horse, but I'm made of gas and dust. Who am I?
4. I'm colder than almost anywhere else in the universe. Who am I?
8. I spin like a cosmic lighthouse, flashing over and over again. Who am I?
10. I'm two giant balloons floating above and below the Milky Way. Who am I?
11. I have no Sun, no home—just endless wandering. Who am I?
12. I'm tiny but so heavy that a spoonful of me would weigh as much as an elephant. Who am I?
14. I shine brighter than every other star in Earth's night sky. Who am I?
16. I was born after a giant star exploded, and I'm one of the densest objects in the universe. Who am I?
18. I don't have a mouth, but I can swallow even light. Who am I?
19. I'm a spiral galaxy that has almost stopped making new stars. Who am I?
20. I grow a glowing tail whenever I get close to the Sun. Who am I?
21. I'm three towering columns hiding baby stars inside. Who am I?

1. A citizen scientist helped discover me. Who am I?
2. I end a massive star's life with the greatest fireworks show in space. Who am I?
5. One day I'll dance with the Milky Way. Who am I?
6. I'm the far edge of our galaxy where stars become scarce. Who am I?
7. I'm a giant cloud where baby stars are being born. Who am I?
9. I'm the giant black hole hiding at the heart of our galaxy. Who am I?
13. I hide frozen water in dark craters on the Moon. Who am I?
15. I'm not too hot, not too cold—just right for liquid water. What am I?
17. I'm Earth's faraway cousin with six planetary siblings. Who am I?
19. I steal gas from my neighbor and explode again and again. Who am I?