Time Travel

For years, the ability to travel back and forth through time is one of the dreams of scientists and in fact, even by simple people. To travel through time or time travel means to go back in the past or advance to the future with the ability to come back to the present time. With these options, who wouldn’t want to at least venture on this kind of travel? But what is the possibility and what is at stake?

The possibilities of time travel

Albert Einstein’s laws of general and special relativity have changed people’s understanding of space and time. These are proven theories so many scientists have now come up with plans on how to build time travel ships or capsules. Of course, all of these will be laid on the groundwork of the greatest scientist, Einstein.

In his work, Einstein opened up the possibility to time travel. Due to that, there are more scientists who are now working on time travels. Today, there are a lot of possible options on how people can travel back and forth in time. Although nothing concrete has come forth yet, it is enough for some that there is really a possibility to do so.

One of the best foreseen options is the wormhole. This is a nickname for the Einstein-Rosen Bridge which is named after scientists Nathan Rosen and Albert Einstein. This theory was first talked about in 1935 but to this day, no one has come forth to declare they have discovered one. Still, more and more scientists are contributing theories about wormholes. One of the most recent is from CalTech’s physicist Kip Thorne whose theory was used by Christopher Nolan in Interstellar.

Wormholes are associated with Einstein’s law of general relativity. This says that this hole can act as a bridge between two distant points. This connection is what will create time travel. But first, one mouth of the wormhole should be accelerated to a speed that is alike how light travels and then revert it back while the other remains as is. This will allow time dilation to happen on the moving moth of the wormhole.

Time dilation is yet another proven theory that says a moving clock’s time is slower. This theory is now being used in space program where the International Space Station’s clocks are a bit slower than Earth clocks. This is in recognition to the theory that higher gravity and velocity makes clocks move a bit slower. This is the major reason why clocks on Earth are rarely similar in movement. The greater gravitational pull on Earth makes the movement of the clock slower.

Caveats

There are two foreseen caveats on the Rosen-Einstein Bridge theory. One is that if wormholes are possible, people can only travel back to the time it was created. The other one is that moving one mouth of the wormhole to near-light speed will require gravitational or electronic pulls. For the time being, both of these means are not yet possible.