How likely is a loose planet to have any atmosphere?
It’s pretty cold in interstellar space...
As likely as it is anywhere, but I take your point, if it’s cold enough, the atmosphere would condense and freeze, as on Pluto — depending on what the atmosphere is made of in the first place, and how much of it is there.
Frozen solid, I imagine.
Good point.
Interstellar space is about 3 Kelvin, right?
Radiant energy from a nomad planet’s interior would be quite small.
On Earth, for instance, I think it’s less than 1% of what the sun delivers.