Why is a large cavity with a small hole at constant temperature approximated as a black body?
48617
I don't understand why a cavity with a hole is a black body
143244
How can black holes be so dense?
103498
Does decrease in temperature affect mass $E=mc^2$?
147803
Why does vacuum have a nonzero characteristic impedance towards electromagnetic radiation?
8077
Photons in expanding space: how is energy conserved?
58224
BH singularity? Infinite density
116949
What gives mass to black hole?
9641
An explanation of Hawking Radiation
21173
Black hole formation as seen by a distant observer
8985
What does string theory predict for the singularity inside a black hole?
149084
Black Hole Photon Sphere
22010
Does a diatomic molecule falling into a black hole dissociate?
71307
Is a black hole a perfect black body?
5966
Is a black hole singularity a single point?
63089
Particle in infinite potential well which is doubled in size at $t_0$
59068
What happens to atoms inside a black hole?
87000
The temperature in space is about 3K, however there are almost no atoms in space. How can there be residual heat?