STEPHEN HAWKING’S UNIVERSE: TIME TRAVEL
I’m going to explain about how this physicist thought and his theory about the time travels that he explained of in a documentary.
'Is time travel possible? Can we open a portal to the past or find a shortcut to the future? ". Hawking made these questions.
First Hawking suggests opening the mind to the idea of the fourth dimension: time. The scientist uses a very simple example, driving. When we travel by car and drive straight on , we are travelling in one dimension. If you turn right or left, we add a second dimension. If we also go up or down a mountain road, we find the third. The fourth dimension is time, but how do we find a way to travel through it?. We have three forms to do this:
Wormholes
When we watch a film about the future and see a person entering a tunnel to go to the future, this person can appear in any time and anywhere. So for the scientist this should be as wormholes.
"They're all around us, in the cracks of space and time, but are too small so that we can see," explains the scientist. "At the smallest scale, even smaller than the atoms and molecules, quantum foam exists. Here is where wormholes exist, small tunnels constantly form and disappear. "
Unfortunately, these tunnels are too small, but it may be possible to take one of them and make it big enough for humans or even a spaceship.
But the wormhole has a little problem, which Hawking calls "mad scientist paradox". What would happen if a scientist uses the hole to shoot his past? Now he's dead, then who shot? It is a paradox which makes no sense. This type of situation can cause nightmares for physicists. This kind of time machine would violate a fundamental rule that governs the entire universe: causes happen before effects, and never the reverse. The trip back would be impossible, but what about the future?
Black Holes
Time goes faster in space. Inside each space ship there is a very precise clock, but despite this, all are advanced every day. The problem is not in watches. What happens is that the mass of the Earth drags time and slows it down. For example time gets slower near the pyramids of Egypt
The heaviest object in the galaxy is in the middle of the Milky Way is: a super massive black hole that greatly decreases the speed of time in the galaxy. "It's like a natural time machine," says Hawking. If a spaceship went into orbit in the hole and spend five years orbiting actually have been ten. When they came to Earth, everyone would have five years more than them. The problem?. Approaching a black hole is too dangerous.
Travelling at nearly the speed of light
For Hawking, the solution may travel very fast. According to Hawking, travelling at nearly the same speed of light would carry us into the future. To explain it, the scientist imagines a superfast train that would circle the Earth seven times per second, but not reach the speed of light. The time begins to pass on board slowly, as if we were near a black hole, but more so, as in slow motion. Within a week, the train would travel one hundred years in the future. Of course, building a train to take those speeds is impossible, but we have built something very similar: the particle accelerator.
Hawking conclude that if we travel to the future, we would just have to go very fast, something that is only possible in space. To do so, would require a very fast ship, of enormous size and that could carry a lot of fuel, enough to accelerate to nearly the speed of light. "Four years after taking off, the ship would begin to travel through time. For every hour in the ship, two would pass on Earth "he explains. After two years the ship would reach 99% of the speed of light. Then, one day on board would represent a year on Earth. Our ship would fly to the future.
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