It might essentially represent shortcuts through space caused by the warping of space-time. By traveling through one, you could potentially cover billions of light-years in mere seconds without having to move faster than light at any point. But there was a problem in applying Newton’s indoorairsoftnj laws of motion to light. In Maxwell’s equations, the speed of electromagnetic waves is a constant defined by the properties of the material through which the waves move. There is nothing in there that allows the speed of these waves to be different for different people depending on how they were moving relative to each other.
In 1929, American astronomer Edwin Hubble combined measurements taken by several people and found that distant galaxies were moving away from Earth. It is now understood to be evidence that the universe is expanding. Light emitted by the galaxies is moving towards us, while the galaxy itself is traveling away from us, so the photons emitted by all the stars can still reach us. These wavelengths of light get all stretched out, and duckslide further into the red end of the spectrum, off to infrared, microwave, and even radio waves. Given time, the photons will be stretched so far that we won’t be able to detect the galaxy at all. Finally, we pass the critical speed limit 1 at which the total trip time is a negative number—we’ve gone back in time!
’Asymptotically’ meaning something gets closer and closer to the speed of light, but never quite reaches it. So far, we have not come even close to this speed, the fastest man-made object, a space probe, traveled at just 150 km per second. Ereditato says that he is confident enough in the new result to make it public. The researchers claim to have measured the 730-kilometer trip between CERN and its detector to within 20 centimeters. They can measure the time of the trip to within 10 nanoseconds, and they have seen the effect in more than 16,000 events measured over the past two years. Given all this, they believe the result has a significance of six-sigma—the physicists’ way of saying it is certainly correct.
The crews of our favorite Star Trek shows regularly travel at velocities far outpacing the speed of light. Warp one, a veritable snail’s pace in the world of Trek, is equal to the speed of light. Warp speeds exceeding warp one equal a multiple of C , but the exact speeds are variable, depending on the source material. This is the reason why light cannot interact with dark matter, it is essentially too fast for light to interact with it. Even when something is dark, when hit by light, baryonic matter will become luminous.
So, it’s clear that nothing travels faster than light that we know of, but is there any situation where it might be possible? Einstein’s theory of special relativity, and his subsequent theory of general relativity, is ”built under the principle that the notions of space and time are relative,” de Rham said. ”If someone able to travel faster than light and carry information with them, their notion of time would be twisted as compared to ours,” de Rham said. ”There could be situations where the future could affect our past, and then the whole structure of reality would stop making sense.”
Those photographs, taken today, capture images of the galaxies as they appeared 13 billion years ago, when the universe was less than a billion years old. The fact that more distant objects appear to be younger, due to the finite speed of light, allows astronomers to infer the evolution of stars, of galaxies, and of the universe itself. Special relativity postulates that the speed of light in vacuum is invariant in inertial frames. That is, it will be the same from any frame of reference moving at a constant speed. The equations do not specify any particular value for the speed of light, which is an experimentally determined quantity for a fixed unit of length. Since 1983, the SI unit of length has been defined using the speed of light.
One such distortion is the Alcubierre drive, which can be thought of as producing a ripple in spacetime that carries an object along with it. Another possible system is the wormhole, which connects two distant locations as though by a shortcut. Both distortions would need to create a very strong curvature in a highly localized region of space-time and their gravity fields would be immense. To counteract the unstable nature, and prevent the distortions from collapsing under their own ’weight’, one would need to introduce hypothetical exotic matter or negative energy.