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The interstellar gas if very diffuse.

New Horizons found around 130 hydrogen atoms per liter of space

but it can be very cold or very hot.

This process keeps the cloud at a steady temperature near 8,000 kelvins.

So, does this mean if I were in one of the hot areas I would instantly burn away? Or is there so little heat in the 130 atoms / liter that I would be ok (ignoring the other million other problems with me being in open space)? What does it mean to be hot or cold out in space?