So it turns out Gliese 581d, trumpeted as the "most habitable planet ever found" isnt really that habitable. To start with Gliese 581d orbits its sun about at the same distance Mercury orbits our sun..you know Mercury right ? That blistering hell hole?
Well its not that bad...Gliese 581 is a red dwarf star..which means its weak..in fact so weak that Gliese 581d, even so close would be a dark place! The light that reaches it is so weak it would not even be visible to our eyes(its in the infra-red spectrum). And thats only on one side, as the planet is tidal locked like our moon which means one side is always "light" and the other always "dark". That not so bad right ? Well..ya it is because, if Gliese 581d has an atmosphere and a temperature difference on its sides like yin and yang, thats going to cause huge crazy storms. And again thats if Gliese 581d has ann atmosphere; see being so close to it's sun means that it's going to be hit with solar flares pretty often. Even dim red dwarfs have their excited moments. Most likely at some point in the estimated 2 billion years since its formed the atmosphere would be irradiated and any water would go bye bye. So maybe not the best prospect for life. Unless it got lucky and had a magnetic field similar to ours on earth..but there is no way to tell whether it has a field or an atmosphere because the way Gliese581b orbit doesnt give us a clear enough view to check.
One should also keep in my that all this data is gathered from mathematics and observations from Earth. We dont have a telescope or satilite that can see that far.Its all based on the movement and intensity of the tiny flicker we can see and our guess on how the gravity of orbiting planets effects that flicker.
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