Can you go back in time in a black hole?

Time travel is not possible. A black hole is not an ‘object’ but a “a region of space having a gravitational field so intense that no matter or radiation can escape.” This means, nothing can travel “through” a black hole; once something enters a black hole, it is lost forever.

Can you time travel by moving at the speed of light?

No object can travel faster than the speed of light because as objects travel faster, they get heavier. The takeaway: Travelling at speed can change your experience of time, but time travel by traveling faster than the speed of light is sadly not possible.

Can humans make a wormhole?

To create a wormhole on Earth, we’d first need a black hole. This is problematic: creating a black hole just a centimetre across would require crushing a mass roughly equal to that of the Earth down to this tiny size. Plus, in the 1960s theorists showed that wormholes would be incredibly unstable.

Can you use a time machine to travel hundreds of years?

We can’t use a time machine to travel hundreds of years into the past or future. That kind of time travel only happens in books and movies. But the math of time travel does affect the things we use every day. For example, we use GPS satellites to help us figure out how to get to new places.

Can dark energy stop a time machine from exploiting wormholes?

Physics also predicts that wormholes would have a habit of collapsing, crushing whatever’s inside them. If a time machine is ever to exploit them, we’d have to find a way to stop this inconvenient feature. The mysterious phenomenon of dark energy might provide a solution.

Could we build a real time machine?

Prof Mallett has built a table-top device that illustrates principles he thinks could be used to build a real, working time machine. First, lasers are used to generate a circulating beam of light. The space inside this “ring laser” should become twisted, “like stirring a cup of coffee”, the University of Connecticut professor explains.

Do clocks on airplanes and satellites travel at different speeds?

Although humans can’t hop into a time machine and go back in time, we do know that clocks on airplanes and satellites travel at a different speed than those on Earth. We all travel in time! We travel one year in time between birthdays, for example. And we are all traveling in time at approximately the same speed: 1 second per second.