Astrophysics!!!

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Across
  1. 2. A collection of very large numbers of stars. Also a famous chocolate!
  2. 5. A rock in orbit especially between Mars and Jupiter
  3. 7. An interstellar cloud of dust, hydrogen gas and plasma. It is the first stage of a star's cycle but it can also refer to the remains of a dying star
  4. 8. What we call a shooting star if it hits earth. Your wish will probably not come true then.
  5. 9. A group of stars in a recognizable pattern that appear to be near each other in space. I'm a Leo!!
  6. 10. A shooting star!!!!
Down
  1. 1. Clusters of hundreds of thousands of very old stars (older than eleven billion years)​
  2. 3. A rock smaller than an asteroid, if it strikes earth, its called a meteor.
  3. 4. Clusters less than a few hundred stars, and are often very young –(less than 10 billion years old)
  4. 6. A very large object which orbits the sun. There used to be 9 of them.
  5. 9. A chunk of ice and rock originating from the outer solar system, usually have a tail.