Background radiation is the invisible radiation that is always present in our environment. It comes from a variety of sources, both natural and man-made. Natural sources include cosmic rays from space ...

New research suggests that neutrinos in the early universe may have transformed into a previously unknown form of radiation. This offers a new way to explain certain puzzling observations about how ...

There are hints that the universe may be behaving unexpectedly, and astrophysicists are racing to explain why. Their ideas to account for the surprising result include allowing dark matter and dark ...