Its Astronomy. wow

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Across
  1. 4. The thing that orbits the earth
  2. 5. the other dwarf planet that is somewhat better
Down
  1. 1. the class u will give me an A in.
  2. 2. a dwarf planet we all know and hate on
  3. 3. this person was a massive pop sensations in the early 2000s
  4. 4. we are trying to colonize this planet