Advanced Space Crossword

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Across
  1. 3. a star cluster nicknamed the "seven sisters"
  2. 4. the constellation Cancer is in the shape of a ____
  3. 7. Pluto has how many moons?
  4. 8. the group of galaxies that the Milky Way Is in (Underscore as the space)
  5. 11. the celestial object that is formed by collapsing neutron stars (Underscore as the space)
  6. 12. the brightest star in the sky
  7. 13. Io, Europa, Ganymede, and Callisto were discovered by _______
  8. 14. Weakly interacting massive particle - acronym
Down
  1. 1. Earth's sister planet
  2. 2. The name of the red giant star in Orion's shoulder
  3. 5. The Galaxy that is the closest to the Milky Way
  4. 6. the star Porrima is in the constellation _____
  5. 9. The red planet
  6. 10. The arm that our solar system is in (Underscore as the space)