!!!~~~Time Travel: More Possible Than You Think~~~!!! At its most basic level, time is the rate of change in the universe -- and like it or not, we are constantly undergoing change. We age, the planets move around the sun, and things fall apart.Time travel is the concept of moving between different points in time in a manner analogous to moving between different points in space, generally using a theoretical invention known as a time machine. Time travel is a staple of science fiction stories, but is it actually possible? It turns out nature does allow a way of bending time, an exciting possibility suggested by Albert Einstein when he discovered special relativity over one hundred years ago.Newton’s classical mechanics was based on the premise that time passes uniformly anywhere and everywhere. Einstein’s special theory of relativity, however, tells us that the flow of time is not constant everywhere in the universe. The faster you move, the slower time will be–until you reach the speed of light, where the flow of time will appear to stop. This essentially proves that time travel into the future is possible; all you need to do is ride a spaceship that moves at a speed close to the speed of light, orbit the Earth for quite some time, and then return. If your spaceship moves at 95% the speed of light and you orbited Earth for 1 year, when you return 10 years would have passed on Earth.Einstein’s general theory of relativity deals with gravity and the fabric of spacetime. In Einstein’s picture of the universe, space and time are combined into one spacetime, and the geometry of spacetime is affected by the matter that is in it. Einstein showed that the fabric of spacetime can be bent, stretched or twisted depending on the matter within it. We can take advantage of this to be able to travel faster than light; all we need is a rotating black hole. The rotating black hole continuously twists the spacetime around it. Therefore, if we could orbit the black hole at a speed very close to the speed of light, an outside observer would see us moving at a speed faster than light depending on how fast the spacetime is being twisted. We are not breaking the laws of physics here, as we are not actually moving faster than light. It is when viewed from the outside that we will appear to be doing so, because of the addition of velocities.
Posted on: Thu, 18 Dec 2014 14:21:07 +0000
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