Thinking in the posibility of extraterrestrial life,
I think that gravity could be a fundamental factor for evolution,
I mean, in darkest zones of universe, where is dust, little mass accumulation, and perhaps low bright, low energy stars, there must be low gravity, and finally, would be high clock rates..(relative to earth)
So the bigger mass (perhaps brighter stars) it is subject to more intense gravity
Finally we could be (relative to other zones of universe) in a high clock rate zone or a in a very low, and that relative difference of clocks could be a clue for our search of intelligent life.
Perhaps the search of low gravity zones, could be the search of (relative to us) faster rates of evolution, to exaggerate: a millon years in what it takes a year here.
Life could need Carbon, Life could need star light, but I am deeply sure that first of all, Life need time.
Could it be a possible guide to search intelligence, stop searching earth like with sun like stars, and start looking at the dark (or whatever that indicate less gravity) ?