Time is malleable. And I would like to exploit it.
Global positioning satellites are able to do it although they only pick up an extra third-of-a-billionth of a second each day. Since time passes faster in orbit, they get to zip a bit, unlike those of us stuck on Earth where mass drags on time and slows it down. I think that I can feel this gravitational time dilation sometimes. I’ll bet you do too.
Keep in mind that any event that occurs in the universe has to involve both space and time.
Gravity pulls space AND time.
Unfortunately, I would have to circle a black hole without getting sucked in to experience time at half the Earth rate. If I could handle a year long circling, two years would have passed on Earth
Albert Einstein told us that time passes more slowly the closer you approach the cosmic speed limit (the speed of light). Einstein liked train analogies. The clock on a speeding train moves slower than a stationary clock. Not that I would really feel it if I was on the train. But if we could get that train moving at 99.999 percent of light speed, one year would pass for us onboard and 223 years would pass back at the train station.
Time traveling into the future happens and scientists have proven this aspect of Einstein’s theory of relativity. When we think of time travel, most of us think of space propulsion technology and time “machines.” But maybe, we should think about cosmic phenomena like those black holes.
If we could circle a black hole long enough, the time dilation will take us into the future, but if go into the hole most scientists believe the hole would crush us. Probably.
In 1963, New Zealand mathematician Roy Kerr proposed the first realistic theory that dying stars that collapsed into a rotating ring of neutron stars would have a centrifugal force would prevent them from turning into a singularity. No singularity and it might be safe to enter and exit through a white hole. The white hole would push everything out and away and into… perhaps, another time or universe. It’s a one-way ticket without a posted destination into the future or past.
Maybe a better path would be via am Einstein-rosen bridge. You might know it as a wormhole. Einstein’s relativity states that any mass curves space-time. The analogy often used is to show a big stretched sheet (a two-dimensional space) that has a ball (planet/mass) on it. The mass moves to the middle, settles and causes the space to curve at that point. Put another smaller ball at the edge of space and it will move toward the larger mass because of the curve in the space.
Fold that two-dimensional space over with a ball on the top and another ball of equal size on the bottom at a point that corresponds with the location of the mass on the top, the two would eventually meet. That is how wormholes – a kind of tunnel that joins two separate times – might develop and allow passage between them.
All theory. And we didn’t even touch upon cosmic strings that some scientists believe were formed in the early universe and are thinner than an atom and under such enormous pressure that they have a huge gravitational pull on anything that passes near them. Those things would travel at incredible speeds and benefit from time dilation enough for that object (our spacecraft?) to propel itself into the past.
An article on How Time Travel Works got me started on this post – and there is plenty more to read about How Time Works and How Special Relativity Works (What is relativity anyway?) and Is Time Travel Possible? and How Black Holes Work.