On the grand cosmic scale, our little corner of the Universe isn't all that special – this idea lies at the heart of the Copernican principle. Yet there's one major aspect about our planet that's peculiar indeed: Our Sun is a yellow dwarf.
"On this basis, there is good theoretical reasoning to support resolution II, although we emphasize that it remains observationally unverified."Resolution III: A Truncated Window for Complex LifeThis may seem counter-intuitive, but it has to do with the pre-main sequence phase of the star's life, before it starts fusing hydrogen. In this state, the star burns hotter and brighter; for red dwarfs, it lasts about a billion years.
This could mean that the window for complex biology to emerge on rocky planets on white and yellow dwarfs is a lot longer than it is on red dwarfs.Finally, although around 16 percent of red dwarfs with exoplanets are listed as hosting rocky exoplanets in the habitable zone, perhaps these worlds are not as common as we thought.
Since the low-mass red dwarfs are, in fact, the most numerous, this could mean that habitable zone rocky exoplanets are 100 times less common around red dwarfs than they are around yellow dwarfs. "In this case, intelligent life is rare amongst the cosmos and spawns universally between M- and FGK-dwarfs, but habitable worlds are at least two-orders of magnitude less common around M-dwarfs than FGKs,""Two orders-of-magnitude is a considerable difference making this a particularly interesting explanation.
Having done that, if we find rocky exoplanets, we can take a closer look at their potential habitability, determining if they orbit in the habitable zone, and if life there could have been stymied by stellar processes.,"resolving the red sky paradox is of central interest to astrobiology and SETI, with implication as to which stars to dedicate our resources to, as well as asking a fundamental question about the nature and limits of life in the cosmos.
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