Dark matter may not interact with light, but one of the proposed properties of this substance in some models has to do with the decay of its more unstable particles — which do release photons ...

Decaying dark matter may solve the mystery of how supermassive black holes formed in the early universe, giving them time to grow into the behemoths that they are now.

If dark matter is composed of hypothetical particles called axions, then there is a chance that these particles could "decay," breaking down into other particles.

It's known as the H I hydrogen line, or the 21-centimeter line. Hydrogen consists of a single electron bound to a single proton. When the spins of these two are aligned in the same way, hydrogen ...