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The gas-giant planets in our solar system all have large moons.
Most of the oceans in the Solar System are deep beneath ice shelves.
Before 1995, the only planets we knew about were the planets in our solar system.
The geysering on Enceladus is the most astonishing phenomenon we have in our solar system.
The solar system can support a trillion humans. And then we'd have a thousand Mozarts and a thousand Einsteins.
Titan is Saturn's largest moon, and, until Cassini had arrived, there was the largest single expanse of unexplored terrain that we had remaining in our solar system.