[Space] Gliese 581

[Fred Brackin]

Originally Posted by Critical

I’m not sure why you would need precisely that scenario or why any such scenario would be “exotic.”

There are so many red dwarfs compared to other stars, perhaps as much as 75% of the stars in the galaxy, that you are going to find all sorts of “exotic” scenarios if you examine enough of them.

As to the first, substitute "low probability" for "exotic" if you like the verbiage better.

As to the gas giant moon thing it still probably leaves you with an unhelpfully slow rotation rate relative to the sun.

Then there's the red dwarf thing. Yes there's a lot of them but you have to start out by eliminating all of them formed from the galaxy's primordial gasses. Those have solar systems that are all hydrogen and helium.

You need a third generation star formed from post-supernova gas clouds rich in heavier elements. The first generation of G-type stars have probably all left the main sequence. The first gen of red dwarfs is still here and will be for another 90 billion years.

Raw/undiferentiated stats about numbers of stars are seldom useful when talking about potential planets.

Ther habitability of some planet circling Gliese 581 can not yet be ruled out but it is for multiple reasons less probable than some lifezone planet circling a randomly selected G-class star.