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

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 ...

Imagine the ultimate version of a toy Universe: it's expanding, it's full of material, and through it all, there's one photon ⁠— or quantum of light ⁠— that we keep track of and forbid ...

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.

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.

The team found that the amount of starlight, or the number of photons (particles of visible light) that stars have emitted throughout the history of the observable universe is 4×10^84 photons.

Here is the history of light, according to physics. Beyond what we can touch, taste, smell, and hear, we experience the universe through light. But how did we come to discover light, and how did ...

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 ...

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 ...