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NASA Announces Results of Epic Space-Time Experiment
Time and space, according to Einstein's theories of relativity, are woven together, forming a four-dimensional fabric called "space-time." The mass of Earth dimples this fabric, much like a heavy person sitting in the middle of a trampoline. Gravity, says Einstein, is simply the motion of objects following the curvaceous lines of the dimple.
The results of Gravity Probe B give physicists renewed confidence that the strange predictions of Einstein's theory are indeed correct, and that these predictions may be applied elsewhere. The type of spacetime vortex that exists around Earth is duplicated and magnified elsewhere in the cosmos--around massive neutron stars, black holes, and active galactic nuclei.
originally posted by: Itisnowagain
a reply to: neutronflux
Time travel is possible..... is this true?
Yes, yes, and yes.
originally posted by: joelr
Since 1905 it's known that time and space are equally real, hence space-time.
Minkowski and Einstein gave us this knowledge and it has been proving to be correct ever since.
Both are considered part of a greater whole, see "four vector space-time" for a description.
The basic idea is that everything moves at a constant speed (speed of light) in space-time.
If you have zero velocity in space you are moving at the fastest speed in time.
As you increase velocity in space your speed through the time dimension slows.
Eventually close to light speed your time is almost zero.
For massless particles like photons which can actually travel at light speed their speed in time is zero.
So even though a photon moves through space there is no movement in time at all.
Does time stop for a photon?. . . It is really not possible to make sense of such questions and any attempt to do so is bound to lead to paradoxes. There are no inertial reference frames in which the photon is at rest so it is hopeless to try to imagine what it would be like in one. Photons do not have experiences. There is no sense in saying that time stops when you go at the speed of light. This is not a failing of the theory of relativity. There are no inconsistencies revealed by these questions. They just don't make sense.
originally posted by: dlbott
a reply to: neutronflux
It really is a stupid argument to say time is an illusion lol.. fact is that it is measurable and therefore can not be an illusion lol.
you can argue all you want to about it but if you still say it does not exist then you really are the one living in an illusion in your mind lol...
originally posted by: 00018GE
Of course time travel is real, your doing it right now!