Our Mysterious Universe

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Across
  1. 1. Hottest type of star
  2. 5. Shape of our galaxy
  3. 6. First name of Ptolemy
  4. 7. Invented Law of Gravitation (last name)
  5. 9. First astronomer to study the sun in detail
  6. 10. Location of the Arecibo Dish
Down
  1. 2. Where is Stonehenge located?
  2. 3. What does the "M" mean in MACHO?
  3. 4. Name of large crater in Arizona
  4. 8. Pluto is a _____ planet, like an asteroid