Space! Space! Space!

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Across
  1. 2. A collection of billions of stars and solar systems.
  2. 4. A small rock that orbits the sun in space.
  3. 6. A group of stars that sometimes make up a picture or pattern.
  4. 8. A place where anything, even light, can get sucked up.
Down
  1. 1. One of them is Earth.
  2. 3. A man who goes to space for study
  3. 5. An object that orbits the Earth
  4. 7. To the human eye, they are small dots all over the sky.