Solar system

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Across
  1. 3. tilted rotational axis, its faint rings, and its ice giant composition.
  2. 4. contains 99.86% of the mass of the entire solar system and is a massive star.
  3. 6. the atmosphere, the hydrosphere, temperature, gravity, and atmospheric pressure
  4. 7. has a very thick atmosphere
  5. 9. spins opposite direction of Earth and most other planets.
Down
  1. 1. has its unique geological features and potential for past liquid water
  2. 2. It's the fastest planet, zipping around the Sun every 88 Earth days
  3. 4. is a massive ball made mostly of hydrogen and helium
  4. 5. is the only planet in our solar system not visible to the naked eye.
  5. 8. its location in the Kuiper Belt, beyond Neptune, and its unique geological features suggest it may have formed elsewhere in the solar system and then migrated to its current orbit