Solar System

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Across
  1. 2. Oldest planet
  2. 5. there is a black hole at the heart of large ones
  3. 6. Our “space neighborhood”
  4. 8. first observed in March 2005
Down
  1. 1. Egg shaped orbit
  2. 3. equatorial diameter of 7926 miles
  3. 4. 4 hour days
  4. 7. has a quasi-satellite