Neutrons

The early universe immediately after the big bang, with a chaotic background of energy and particles. Small, dense black holes, some the size of an atom, are scattered throughout the image. These black holes are described with a "color charge" aura, symbolizing the unique property of quarks and gluons. Around the black holes is a cosmic landscape of quark-gluon plasma, with hints of the beginnings of proton and neutron formation. The image was prepared using DALEE and is not a scientific image

Exotic black holes may be a byproduct of dark matter

Fifty years ago, physicist Stephen Hawking proposed that dark matter might be a population of black holes, which may have formed shortly after the Big Bang. They also existed for a short time but had an impact on
Simulation of an atom. Source: Argonne National Laboratory / flickr

The mystery of the neutron