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2.4 times Earth gravity would not be so much of a problem for life under water. Some life on Earth lives in the deep oceans under enormous pressure.
There would however be the issue of a possible large moon, possible tidal-locking, axial instability in the absence of one, or gravitational variation around the center of mass or barycenter if a large moon or binary planet system was involved.
If we are looking at the possibilities of life and abiogenesis there are some interesting points on this discussion: - http://richarddawkins.net/articles/643549-origin-of-life-challenge-how-did-life-begin#page1
Permalink Wed, 07 Dec 2011 11:52:09 UTC | #896419