Scavenger Hunt Crossword

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Across
  1. 2. A citizen scientist helped discover me. Who am I?
  2. 5. I have no Sun, no home—just endless wandering. Who am I?
  3. 6. I'm two giant balloons floating above and below the Milky Way. Who am I?
  4. 8. I'm a giant cloud where baby stars are being born. Who am I?
  5. 10. I'm the giant black hole hiding at the heart of our galaxy. Who am I?
  6. 11. I'm not too hot, not too cold—just right for liquid water. What am I?
  7. 12. I spin like a cosmic lighthouse, flashing over and over again. Who am I?
Down
  1. 1. I'm colder than almost anywhere else in the universe. Who am I?
  2. 3. I look like the head of a horse, but I'm made of gas and dust. Who am I?
  3. 4. I don't have a mouth, but I
  4. 7. I'm three towering columns hiding baby stars inside. Who am I?
  5. 9. I was born after a giant star exploded, and I'm one of the densest objects in the universe. Who am I?