This marks the first time that the Universe becomes transparent to light. The leftover photons from the Big Bang, now long in wavelength and low in energy, can finally travel freely through the ...

Did light shine in the universe’s earliest moments, or was it hidden from view? While this question may seem simple at first, ...

Intergalactic gas clouds are slightly hotter than they should be, new research claims, and theoretical particles called 'dark photons' could explain it. When you purchase through links on our site ...

The photon is aloof from its peers. Massless, it races through the Universe at the speed of light, un-aging from the point of view of our slow-moving selves.

For the first time in history, we can explore the universe through a rich blend of senses—seeing, touching, and hearing astronomical data—in ways that deepen our understanding of space. While ...

Remember that photons can do two things: They can roam freely through the universe, existing as independent entities (this is light), and they do the legwork of mediating the electromagnetic force ...

We can't see all the way back to the Big Bang. The early Universe was filled with a thick, murky, opaque fog of ionized plasma. This medium was impenetrable to light; any photons moving through ...

The hydrogen could simply float through space, but photons from the big bang were essentially trapped among them. Yet there was still light we can perceive because hydrogen atoms naturally glow on ...

As part of the Q-NEXT quantum research center, Randall Goldsmith of the University of Wisconsin–Madison studies the interplay of light and matter, harnessing it for quantum information technologies.

This is a very hypothetical form of dark matter, the mysterious, invisible substance that accounts for roughly 80% of all the mass in the universe, yet doesn't seem to interact with light.

We can't see all the way back to the Big Bang. The early Universe was filled with a thick, murky, opaque fog of ionized plasma. This medium was impenetrable to light; any photons moving through ...