[longshadow]

Any thoughts on how this "hot gas" got to be so hot, and why it hasn't radiated most of it's heat out into the surrounding Universe?

Also, is it thought that the "hot gas" is still being heated? If so, what's the mechanism and source of energy to heat it?

Thanx...

[Physicist]

Good questions. I don't know the answers.

[VadeRetro]

Also, is it thought that the "hot gas" is still being heated? If so, what's the mechanism and source of energy to heat it?

Democrats.

[Moonman62]

Any thoughts on how this "hot gas" got to be so hot, and why it hasn't radiated most of it's heat out into the surrounding Universe?

Also, is it thought that the "hot gas" is still being heated? If so, what's the mechanism and source of energy to heat it?

There is also very hot gas that surrounds clusters of galaxies, which also implies the presence of dark matter. I think the gas is heated by supernovas and such. Perhaps some of that hot gas is siphoned off by the dark matter filaments, but that's just a guess.