Originally Posted by Tubba75
Physically, time travel IS possible. You see, when Astronauts fly out of orbit and into out space, they come back so fast that they actually travel backwards in time, but on a microscopic scale, less than 0.000001 Milliseconds. Thus meaning we would need to go so fast in outer space that we go back years, but how do we do so? Orbit around a black hole. How does it work? Simple. A Black hole is actually just an amazingly large build-up of mass, thus, being the heaviest mass with the strongest pull, orbiting it can send us flying in circles faster than the speed of light, but it only feels like a minimal speed to the astronauts. Thus, after re-landing on earth, they could be as far back as the 1970s from now in a matter of circling around a black hole maybe...6 times? Yeah, I know..It's crazy, huh?
This whole paragraph sounds like complete bullshit. Would you mind posting some sources that verify these claims? Because, one, it has been proven that you cannot travel faster than the speed of light, two, you could not orbit a black hole because the gravitational pull would be too strong to sustain orbit, and, three, speed is measured in distance traveled in a certain duration of time mean time is going forward to measure speed, so how can speed, a measurement that is based on forward time result in time going backwards?
Last edited by IceShadow; Jan 16, 2011 at 09:51 AM.
[RAWR]NutHug: I CAN MAKE DIAPER BROWN
Because, one, it has been proven that you cannot travel faster than the speed of light,
Speed of light is relative, if you move with a certain speed, you send out light with the speed of light relative to you. Speed is always measured from a certain frame of reference, therefore speed of light may vary.
two, you could not orbit a black hole because the gravitational pull would be too strong to sustain orbit,
You can actually orbit a black hole, with some distance or a lot of speed. You wouldn't accelerate by orbiting though, because the gravity on the object does not contribute in the direction of the speed, but perpendicular to it, as centripetal force.
and, three, speed is measured in distance traveled in a certain duration of time mean time is going forward to measure speed, so how can speed, a measurement that is based on forward time result in time going backwards?
You can't go back in time, but you can go slower than the "other time". Example:
A twin, A and B, is 20 years old. A goes into space for 10 "earth years" with a speed of 0,866 times the speed of light. According do special relativity, A would return when he was 25 and B would be 30. They would be able to celebrate their birthday together.
Also, a bit on special relativity for those interested:
Einstein assumes two things to get to a decent conclusion:
1. The general relativity, the laws of physics are applicable to all frames of reference.
2. The speed of light is constant from all points of reference, whether the source moves or not.
This means place and time are distorted if an object has a certain velocity. This happens according the Lorentz transformation:
Where β = v/c and y = (1-β²)^-(1/2)
The left vector is the Minkowski-space, for an object moving in a straight line. You can see the object gets smaller and seems to move slower, for someone standing relatively still, if the speed high enough is to make β significant different than 0 ( so v approaches c).
Thanks for the Avatar, MrAakash
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