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Even if there was heavy bombardment, it wouldn't be everywhere at once, and deep sea vents would be somewhat protected by kilometers of water. (assuming the bom
by hyperpallium 9y ago
Even if there was heavy bombardment, it wouldn't be everywhere at once, and deep sea vents would be somewhat protected by kilometers of water. (assuming the bombardment wasn't so severe as to vapourise the ocean).
That life was present as soon as earth was hospitable fits with the intriguing theory that extrapolates the origin of life to predate earth, based on the rate of increase in complexity: http://www.davidyerle.com/where-are-the-aliens/ http://www.davidyerle.com/where-are-the-aliens/ (actual article pdf 287kb: https://arxiv.org/pdf/1304.3381 https://arxiv.org/pdf/1304.3381)
- md224 9y agoUmm... that’s a pretty remarkable finding... how is this the first time I’m hearing about this? Is their evidence considered too weak or speculative to challenge the currently accepted timeline? I thought we had this whole evolution thing (mostly) figured out...
- IntronExon 9y agoPanspermia as a theory has been around for a while, but there’s no real evidence to support it yet. The weaker forms of the theory don’t postulste life as being extraterrestrial, but the complex organic building blocks of life could be. Until a rigorous model of life can be developed, until life can be created in vitro from non-living stuff, or until evidence of life or complex organics can be found beyond Earth it’s hard to prove or disprove. The same can be said of pretty much all theories concerning the origin of life on Earth though. https://en.m.wikipedia.org/wiki/Panspermia https://en.m.wikipedia.org/wiki/Panspermia
- hyperpallium 9y agoIt's more an intriguing hypothesis than an accepted finding. The reasoning is interesting and plausible.