But consider red dwarf stars, the runts of the universe. Their masses are considerably less than Sol’s, which means they burn more slowly. The consequence? Red dwarfs with one-tenth the mass of the Sun have lifespans that are up to a thousand times longer.
All else being equal, that would give red dwarfs a thousand times the probability of eventually using its energy to host a world with life. Clearly, it’s most probable that this life would arise not when these stars are still young – which they all are now – but instead during their long adulthood. In other words, the red dwarfs are just getting started, and their biologically fecund years are still ahead.
And here’s an additional fillip: Red dwarfs are as plentiful as bad drivers, comprising three-fourths of all stars. So not only are they individually a thousand times more likely to become winners in the biology lottery, there are a lot more of them buying tickets.
Loeb argues that, looking back on creation ten trillion years from now when the curtain is falling on the universe-as-we-know-it, you’d have to say that the overwhelming majority of life arose around red dwarf stars – and on average, trillions of years after Earth was over and done.
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