Strange life-forms found deep in a mine point to vast 'underground Galapagos'
I think it's very likely that life has originated on Earth many times. If it happened once, so early in the age of Earth - it should happen more than once.But the developed descendants of the first life outcompeted the later ones immediately so we only ever discover life that is related to us.But if we search where life related to us couldn't go - maybe we'll find completely independent trees of life?