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> This is one of my theories about why there isn't any alien life around.

Do we need a theory on this yet? I mean... out of all the planets we've explored reasonably thoroughly so far, 100% have had life at some point.

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I've not heard that Mars had life at some point in its history. In fact I've not heard mention of any planets hosting life in their past, do you have some sources that you can point me to?

It's about the definition of 'reasonably thoroughly'. We haven't explored much of Mars, having covered only single digit square kilometers up close (and most of that geologically).

Uh, yeah? Von Neumann machines should be everywhere by now; yet there is no evidence of them.

Life yes. Intelligent life, no.

Intelligence might not even bet he end goal of evolution even life is very common, intelligence might not be.

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