"Alien earths may be plentiful" This one and the variant about life probably existing on a jillion other planets. They never have any real evidence, and although the details may vary (like the stuff about the metals here), it's always nearly pure conjecture and speculation.
The fascination of the modern secular mind with this stuff is in itself fascinating. It's a little sad, really: as if this is their last possible refuge for hope that the universe is not pretty much a dead place.
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