What type of physical world is Proxima b suggested to be?
Answer
A rocky world
Observations strongly suggest that Proxima b possesses the characteristics of a rocky world, meaning it likely has a solid, terrestrial surface, similar to Earth. This determination is based on its minimum estimated mass, which is calculated to be only slightly larger than that of Earth. The presence of a rocky foundation is a necessary prerequisite for the theoretical possibility of liquid water pooling on its surface, which is central to discussions of its potential habitability.
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