The day João Magueijo began to doubt Albert Einstein started inauspiciously. It was a rainy winter morning in 1995 at Cambridge University, where Magueijo was a research fellow in theoretical physics.

Hello, this is Mu-san.Today, I'm talking about the discovery of a star that orbits the center of the Milky Way galaxy at 8 ...

What would happen if a palm-sized, fluffy marshmallow entered Earth's atmosphere at the speed of light?You might think that ...

The theory of special relativity is rife with counterintuitive and surprising effects, the most famous of which are length contraction and time dilation. If an object travels at a relative speed, ...

A NASA engineer cracked a design that could push spacecraft to 99% light speed—here's the wild physics behind an engine that ...

Add Yahoo as a preferred source to see more of our stories on Google. A new review tightens limits on whether light changes speed in deep space, sharpening one of physics' most important tests.

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When an object moves extremely fast—close to the speed of light—certain basic assumptions that we take for granted no longer apply. This is the central consequence of Albert Einstein's special theory ...

The speed of light has been one of science’s most trusted markers of stability. For more than a century, the idea that light moves through space at a constant speed has supported some of physics’ most ...

Science fiction authors and readers dream of travelling at the speed of light, but Einstein tells us we can’t. You might think that’s an arbitrary rule, but [FloatHeadPhysics] shows a different way to ...

(Credit: ktsdesign/Shutterstock)Signals in the brain hop from neuron to neuron at a speed of roughly 390 feet per second. Light, on the other hand, travels 186,282 miles in a second. Imagine the ...

[Brian Haidet] published on his AlphaPhoenix channel a laser beam recorded at 2 billion frames per second. Well, sort of. The catch? It’s only a one pixel by one pixel video, but he repeats it over ...