re: A huge gap in the universe
I'm an Engineer, not a scientist, and I don't understand this statement. How does a photon gain energy when passing near matter, and lose it when it's far away from matter - and where does the energy come from/go to in these cases?
"Photons of the CMB gain a small amount of energy when they pass through normal regions of space with matter, the researchers explained. But when the CMB passes through a void, the photons lose energy, making the CMB from that part of the sky appear cooler."
Marcus Massey