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Will_Newsome comments on Open thread, September 2-8, 2013 - Less Wrong Discussion
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There has recently been some speculation that life started on Mars, and then got blasted to earth by an asteroid or something. Molybdenum is very important to life (eukaryote evolution was delayed by 2 billion years because it was unavailable), and the origin of life is easier to explain if Molybdenum is available. The problem is that Molybdenum wasn't available in the right time frame on Earth, but it was on Mars.
Anyway, assuming this speculation is true, Mars had the best conditions for starting life, but Earth had the best conditions for life existing, and it is unlikely conscious life would have evolved without either of these planets being the way they are. Thus, this could be another part of the Great Filter.
Side note: I find it amusing that Molybdenum is very important in the origin/evolution of life, and is also element 42.
(Are you Adele Lack Cotard?)
Like in Synecdoche, New York? No... it is an abbreviation of my real name.