1. If liquid water is rare on the surface of planets, then most Terrestrial planets must have…

1. If liquid water is rare on the surface of planets, then most Terrestrial planets must have CO2-rich atmospheres. Why? 2. If you visited a planet in another solar system and discovered that it was heavily cratered, but its small moon was nearly crater free, why would that be a surprise? Speculate about what might have happened to those objects.  

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