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Why Does Gravity Travel at the Speed of Light?

We all know light obeys a speed limit — roughly 186,000 miles per second. Nothing travels faster. But why should gravity travel at the same speed? That question requires a quick dive into Albert Einst... read more

Why Can’t We Travel At The Speed of Light?

After all, how many among us thought we could defy gravity with a sheet or a cape ... greater impulse to further increase the speed. Here we can finally see why nothing can travel at the exact speed o... read more

Faster-than-light travel: are we there yet?

Did he know something about a secret theory of faster-than-light travel? Hardly. Asimov was participating ... fans of science fiction don’t give them a second thought. Why can’t we really exceed the s... read more

Was the speed of light faster at the beginning of the universe?

Plus we still have no idea what caused inflation, nor why ... the speed of light is the cosmic speed limit – defining the maximum speed that any information, or any force, can travel. This means the s... read more

Why the speed of light matters

That is why this result is so surprising and unexpected." If the finding of the OPERA experiment does pan out, the implications are much more mind-bending. Under special relativity, if something trave... read more

Why is the Scale of the Universe so Freakishly Large?

But why must this be so? And why does our Universe exhibit ... sprung into existence with a stronger gravity, it would have collapsed back into a dense state a long time ago. Koberlein says that the s... read more

Astroquizzical: How Does Gravity Escape From A Black Hole?

it ‘moves’ in a different way that’s not subject to the same rules as light,” then why does it move at the same speed? There’s a few things tangled up in here, but let’s see if we can untangle them. T... read more

Will we ever have a theory of everything?

But there's no particle to carry the force of gravity. Some physicists think there is. They call this particle the "graviton". Gravitons would have to have no mass, spin in a particular way, and trave... read more

Time travel is possible – but only if you have an object with infinite mass

Can we travel much further into the future? Absolutely. If we could travel close to the speed of light, or in the proximity of ... time machine in the journal Classical & Quantum Gravity. This new mod... read more

Why does gravity move at the speed of light?

If the calculational framework of general relativity is accepted, the damping can be used to calculate the speed, and the actual measurement confirms that the speed of gravity is equal to the speed of ... read more