Originally Posted by Stu Pidasso
These planets are so close to thier parent star that they are awash in radiation(the daylight side is).
It could be that life will only arise on planets with large moons which stabilize the orientation of the the spin of the planet. Once we understand abiogenesis we will be in a much much better position to make guesses about which planets harbor life or not. Until then its really a waste of time.
You assume that life cannot adjust to this radiation, perhaps finding a way to thrive in it.
We didnt think life could exist in environments such as this:
Then we started finding them. Life thriving in extremely acidic and hot conditions in complete darkness.
Of course we only have a limited understanding on abiogenesis and what forms and conditions life can exist in but the more we look into extremes on our own planet the clearer it is that evolution is always there ready to adapt life to the environment it finds itself in.
Btw the reason the term "goldilocks" exists for these planets (this is Gliese 581g if you want to google it) is it is "just right" in the zone of habitable distance from its star:
The reason it is in the zone is because it orbits a much smaller and cooler star than our own so while it is closer in absolute terms it is also relatively similar. It is on the right:
It is also the 87th closest star system to our own and 20 light years away, which is truly amazing when you think about it in statistical terms that we found the first planet capable of supporting life as we know it within such a short distance.