That definition is a bit too broad. Water in zero-G will form spheres of microscopic size. I'm sure there are other materials that can form spheres in a vacuum and at very low temperatures. We must take it as given that those favoring that particular definition are talking about "threshold mass" rockpiles and extremely large volumes of gas and liquids, in a DIRECT orbit around a star. Otherwise astronauts in space would create planets when they sneeze. ;) --- Joe Bauman <bau@desnews.com> wrote:
Very good point, Kim. When I was talking with my son, Sky, the other day he suggested the same definition for a planet, large enough that its gravity forms it into a sphere and in orbit around a star.
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