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The expansion of the universe causes distant galaxies to recede from us faster than the speed of light, if proper distance and cosmological time are used to calculate the speeds of these galaxies. However, in general relativity, velocity is a local notion, so velocity calculated using comoving coordinates does not have any ...


One question often asked about relativity is "what would happen if we went faster than light?". It's sometimes said that time would run backwards. Special relativity tells us that this is simply not possible. The universe has a speed limit of just under the speed of light, and it has a clever way of stopping us from breaking it.


Jan 5, 2015 ... Time ran slower for the moving clocks just as Einstein predicted. So the faster something travels, the more massive it gets, and the more time slows – until you finally reach the speed of light, at which point time stops altogether. And if time stops, well then, so does speed. And so nothing can travel faster than ...


The point is that though it's fun to think about and enjoy in science fiction, truly going faster than the speed of light is a violation of the laws of physics and therefore can not really be discussed by physics. I can't say time would reverse itself or not exist or anything because those aren't even options. It's like if I invited you out to ...


Feb 19, 2014 ... Recall that the speed of light – described mathematically as c – is approximately 300,000,000 meters per second. In two seconds, light travels 600,000,000 meters . In zero seconds, light travels zero meters. If time were stopped zero seconds would be passing, and thus the speed of light would be zero.


Dec 22, 2006 ... First off, there is no evidence that a spaceship can travel at the speed of light. It would take an infinite amount of energy. Plus, time would stop for you, so you couldn't do the experiment. But let's say the spaceship was moving at 0.9 c. The important thing to realize is that distance and time are not fixed ...


Sep 18, 2015 ... He argued that if finite speed was the problem, and light really did take time to get around, the same delay ought to be visible in measurements of Jupiter's other .... In 1999, researchers brought laser light to the speed of a bicycle, and later to a dead stop, by passing it through a cloud of ultra-cold atoms.).


May 18, 2011 ... This is because time slows for you as your get closer to light speed, and at it, it completely stops. This is ... The reason for this speed is the same reason why light travels at the speed it does. ... So to sum up, nothing can travel faster than light because the speed of light can be thought of as infinite speed.


In 1638, Galileo proposed an experiment to observe the speed of light by measuring the time delay of uncovering a lantern. His experiment involved two ... The theory of relativity explains why it is not possible to physically go faster than the speed of light, however, it does not rule out FTL travel. Particles have been known to ...