## Would you travel back in time if you went faster than light?

Time Travel Special relativity states that nothing can go faster than the speed of light. If something were to exceed this limit, it would move backward in time, according to the theory.

## Why does Lightspeed stop time?

The speed of light is very fast (300,000 km/s or 670,000,000 mph), far faster than any speed that a typical human experiences relative to the stationary observer. In the limit that its speed approaches the speed of light in vacuum, its space shortens completely down to zero width and its time slows down to a dead stop.

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Does time stop for a photon?

From the perspective of a photon, there is no such thing as time. It’s emitted, and might exist for hundreds of trillions of years, but for the photon, there’s zero time elapsed between when it’s emitted and when it’s absorbed again.

### Does time stop at Lightspeed?

The simple answer is, “Yes, it is possible to stop time. All you need to do is travel at light speed.” Special Relativity pertains specifically to light. The fundamental tenet is that light speed is constant in all inertial reference frames, hence the denotation of “c” in reference to light.

### Why does time change with speed?

The faster the relative velocity, the greater the time dilation between one another, with time slowing to a stop as one approaches the speed of light (299,792,458 m/s). For sufficiently high speeds, the effect is dramatic. For example, one year of travel might correspond to ten years on Earth.

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At what speed does time stop?

light
This case is sometimes called special relativistic time dilation. The faster the relative velocity, the greater the time dilation between one another, with time slowing to a stop as one approaches the speed of light (299,792,458 m/s).

#### What happens to the clock when you travel at the speed of light?

The clock in motion will tick more slowly than the clocks we’re watching on Earth. If you’re able to travel near the speed of light, the effects are much more pronounced. Unlike the Twin Paradox, time dilation isn’t a thought experiment or a hypothetical concept––it’s real.

#### Is it possible to slow down the speed of light?

Slowing light this way doesn’t violate any principle of physics. Einstein’s theory of relativity places an upper, but not lower, limit on the speed of light. According to relativity theory, an astronaut traveling at close to the speed of light will not get old as fast as those she leaves behind on Earth.

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Can you travel near the speed of light?

If you’re able to travel near the speed of light, the effects are much more pronounced. Unlike the Twin Paradox, time dilation isn’t a thought experiment or a hypothetical concept––it’s real.

## How do lasers slow down light?

The first laser sets up a “quantum interference” such that the moving light beams of the second laser interfere with each other. When everything is set up just right, the light can be slowed by a factor of 20 million. The process is described in detail in the Feb. 18 issue of the scientific journal Nature.