Meddling with physics is still big fun for a SF writer!
Thanks to my hyperboles suppliers Pascal Colpron (eternity), Robin Dumont (hair) and André Lavoie (minus a thousand). The ET visitor comes from a Le Bob original creation.
Matter falling in a black hole get heated up, so much that it emits a stream of X rays. In the panel with the car in space, a Cygnus X1 like binary system is illustrated, a star with a companion black hole.
The mean universe temperature is about 3 Kelvin. The fossil microwave picture is a courtesy of NASA.
As for the Big Crunch, well, there’s still some time before, if it happens!