Unseen ‘dark radiation’ may hold the key to mysteries of dark energy

There are hints that the universe may be behaving in unexpected ways, and astrophysicists are scrambling to figure out why. Their ideas to explain this surprising result include allowing the interaction of dark matter and dark energy, as well as the creation of a strange “dark radiation” that is essentially like ordinary light but invisible to the naked eye. It involves asserting your existence.

In April, researchers using the Dark Energy Spectroscopy Instrument (DESI) in Arizona released the largest 3D map of the universe ever created, suggesting…