Treasure Hunt

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Across
  1. 2. how many planets are in Milky Way (couting with dwarf planets)?
  2. 4. what is an UFO?
Down
  1. 1. How many dwarf planets have in Milky Way?
  2. 2. how many types of galaxies are in the solar system?
  3. 3. the sun in a dwarf star or a giant star?