2007-04-12 04:39:54 · 14 answers · asked by the_sailor 2 in Science & Mathematics ➔ Physics
Actually is a possibility! We can already see back in time. You'd not thing is possible but its possible. The sun you see is actually how the sun WAS 8 minutes ago. That's because the sunlight take 8 whole minutes to reach the earth!! Looking in to outer space in the zillions of stars, one say, 4 million light years away is emitting light that left it 4 million years ago, that mean, we are looking back 4-million years ago.!
In spite of all that, the fact it space-time is no longer thought to be absolute. According Einstein's Theory of general relativity ( Yes you should expect that guy to come in if you ask such questions ) Space-time can be bent. In so doing a time-machine is theoretically possible ... meaning i can do complex mathematical calculations to prove that the position after a certain time of an object can have negative time component ( ie. going back in time ) or an extrapolated positive component ( ahead in time ) . But none of it can be put to use, bcoz it replies on a certain list of assumptions.
It is thus POSSIBLE but highly IMPROBABLE we're gonna make one anytime soon.
2007-04-12 04:50:53 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Today, no. Tomorrow is a different question. It is believed that microscopic particles can move back in time but there is so far no evidence that it can happen at the macroscopic level. There are theories that would allow it but there are some really big problems.
If someone can travel back in time, why haven't they? Or have they?
If time travel is possible, there are the problems with changing your past. Anything you do could cause you to cease to exist. This may have the most incredible ramifications on the state of the universe.
2007-04-12 11:50:51 · answer #2 · answered by Elizabeth Howard 6 · 0⤊ 0⤋
The Science of today has created teleportation devices for particles, it is not yet known how time is effected for this particle. Theory points toward that it slows or perhaps even stops. So we may already have a time machine of sorts.
2007-04-12 11:47:35 · answer #3 · answered by Anonymous · 0⤊ 0⤋
No because if you think about it, if a time machine would be discovered in the future, don't you think that someone would have traveled to the present to see what life was like? We would know if someone was to ever create a time machine.
2007-04-12 11:47:53 · answer #4 · answered by Seana C 1 · 0⤊ 0⤋
Parallel time theories set aside, it is probable to travel backwards and forwards in time. If we could travel at the speed of light (3000000000 m/s) then we could travel back and forth in time. For example, when we looking at stars in the sky, let's say one of them is "1 light year" away from us. That means the distance between Earth and that star is the distance light can travel in a year. That means it has taken one year for the light of that star to reach Earth. So if we look at that star through a telescope, we are actually looking back one year in the past. The same way if a different planet 10million light years away from Earth spotted Earth, then all they would see would be dinosaurs, because it has taken 10million years for the light/image from Earth to reach that planet.
Therefore, if scientists could invent a device or machine that could travel at the speed of light or faster than it, then we would be able to travel backwards and forwards in time. However it seems impossible at the moment because 1. We don't have the technology to create such a device 2. If a device was created, traveling at the speed of light would probably kill you. And so for a decent time machine to work, it has to be able to travel at the speed of light AND be safe. Currently we don't have enough understanding of things in the realm of science to even try building such a device.
2007-04-12 11:58:35 · answer #5 · answered by Chance M 2 · 0⤊ 1⤋
Unless our conception of space and time changes quite radically, it is unlikely that we will ever create a machine that lets us travel backwards in time. We just have to go forward 1 second per second. My second could go faster than someone else's, but it's all gotta be forward.
Edit. And no, GR does NOT permit the sort of time-bending that would allow time-travel, because that would require negative energy density. Tachyons can go back, but we've never observed those and how they'd interact with regular matter anyway is unclear.
Oops, I take that back. My future self just came back to tell me how it works (and to stop using drugs).
2007-04-12 11:42:47 · answer #6 · answered by Anonymous · 0⤊ 2⤋
It is considered a theoretical impossibility, which means that you can't even think of a way to make it work; you can only think of good solid ways of why it doesn't work.
That means you can't even think about designing, let alone building one.
Oh will I feel stupid if my own 85-year-old comes back to tell me not to be such a smartass...
2007-04-12 11:46:01 · answer #7 · answered by mgerben 5 · 0⤊ 0⤋
I think you watch too many tv shows and movies about the subject. Time travel either forwards or backward remains solidly, and scientifically, in the impossible column.
2007-04-12 12:36:46 · answer #8 · answered by Brian K² 6 · 0⤊ 0⤋
Recent thinking is that there are no theoretical problems, but lots of practical ones. There is also the question of logical conundrums such as going back and murdering one of your ancestors.
2007-04-12 11:52:48 · answer #9 · answered by squeezie_1999 7 · 0⤊ 0⤋
Yes
You risk death though!
It's been done already theres a guy that invented one. Not exactly a machine but more of device type box.
2007-04-12 11:48:45 · answer #10 · answered by alphaomegadisciple 3 · 0⤊ 1⤋