SCIENCE

Time travel IS possible and has ALREADY happened, say esteemed physicists
TIME travel is possible and has already happened, according to several reputable physicists.

http://www.express.co.uk/news/science/657500/Time-travel-IS-possible-and-has-ALREADY-happened-say-esteemed-physicists/

Time travel is possible and has already happened

One way to achieve time travel into the future would be travelling at the speed of light in space, as first theorised by Albert Einstein.

The accepted theory is that one would have to build a space ship that can travel at the speed of light, and head out into space.

Theoretical physicist and string theorist Brian Greene, of Columbia University, said: “You can build a spaceship, go out into space [and travel] near the speed of light, turn around and come back.
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“Imagine you go out for six months and you turn around and you come back for six months.”

While you are travelling at the speed of light, time stays slow relative to the people who are standing still back on Earth.

As a result, you would be going fast while your clock would still be going slow.

Prof Greene: “When you step out of your ship, you’re one year older but Earth has gone through many, many years.

“It can have gone through 10,000, 100,000 or a million years depending on how close to the speed of light you traveled.”

However, the only problem is that a machine travelling at such speed would require an “unimaginable” amount of energy, while the stress from the centrifugal force on the body would likely prove fatal.

One way to travel in time is to hang out near the edge of a black hole

But there is another feasible way to travel though time, and once again it involves going into outer space.

Einstein also theorised that if you were to situate yourself on the edge of a black hole, time would pass more slowly.

Prof Greene explains in his Big Think video: “You hang out [next to a black hole] for a while, you come back, get out of your ship and it will be any number of years into the future, whatever you want all depending on how close you got to the edge of the black hole and how long you hung out there.

“That is time travel to the future.”

But time travel has already happened.

Cosmonaut Sergei Krikalev has already travelled through time

Serial ISS resident Sergei Krikalev holds the record for the longest amount of time spent in space with 803 days, 9 hours, 39 minutes under his belt.

The ISS travels at around 7.66 km/s when orbiting around Earth, and due to the high speed and length of time which he spent in space, the cosmonaut actually arrived back in Earth 0.02 seconds in the future thanks to a process known as time dilation.

The time would run a fraction of a millisecond faster when on board the ISS at that speed away from Earth.

Physicist Colin Stuart said in a Ted Talk that time dilation due to gravity “is quite small because Earth’s gravity is quite weak and so the time dilation due to their speed wins out and astronauts really do travel a tiny amount into their futures.”

But for those wishing to travel back in time, you may be out of luck.

Greene says: “No one has given a definitive proof that you can’t travel to the past.

“But every time we look at the proposals and detail it seems kind of clear that they’re right at the edge of the known laws of physics.

“And most of us feel that when physics progresses to a point that we understand things even better, these proposals just will be ruled out, they won’t work.”

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Proof of time travel? Riddle of planes and helicopter found in Egyptian hieroglyphs
The bizarre road tunnel which sends people who drive through it 'BACK IN TIME'

since "time" is nothing but a perception, it cannot happen...

....Greene says: “No one has given a definitive proof that you can’t travel to the past


I am not seeing definite proof anyone was in the future or the past.

brian green... he's a character... but that is no different from the bible thumpers saying there is no proof god doesn't exist...

but all time is is a mathematical equation, not much else... a perception that shows the day went by

One way time travel is easy and has happened many times as described in the original article. Einstein's equations work and are the basis of modern physics. All you need is speed.

Backwards time travel is another story. It may be possible but no one knows how to do it yet.

The physics of black holes open additional possibilities of freezing time.

But time is just math? Afraid not. It is possible now to make one member of a set of twins an old man while the other is still young using nothing but a fast moving spacecraft. That is time travel.

Proof of time travel? Riddle of planes and helicopter found in Egyptian hieroglyphs
The bizarre road tunnel which sends people who drive through it 'BACK IN TIME'


When you look at how far we have advanced in the last 200 years, could this be the second time around ?
What will we have in another 100 years, if we don't destroy ourselves?
There is not a lot to show for ancient technology. However the Pyramids, and a lot of mighty big rocks piled up all over the world came from somewhere.

Oh, now I get it. This thread's first post comes from a site that is similar to The Onion.

no it's not... "proof" is doing it, not speculating on it...

Hmm...critiqued by a guy who thinks he's Alf....

Scripture: 1st, 2nd & 3rd 'Earth Age'
And of course, who is descendent of who?

sounds more like basic principles of relativity...time is individual...if ur traveling at various altitudes at various speeds with or against the earths rotation then time changes for you. physicists have observed photons in time loops which is the only actual evidence I'm aware of but that's on a quantum level. as far as a macromolecular bio-organic lifeform reaching the speed of light... well ur dead.. some theories suggest a massive electric explosion... passing thru a wormhole or a black hole uummmm humans will figure out quantum loop gravity before figuring that out. personally I like to adhere to the idea that time really doesn't exist outside of the human imagination...some say the math will prove it...well what's math but a form of language the human imagination devised...like so many things we'll never really know the answers. but hey if a particle of light can do it then why can't we eventually? but then all the paradoxes come into play... good thread!

I spend a lot of time living in the past does that.. count as time travel?

I wouldn't consider the Egyptians knowing about flying craft evidence of time travel...many ancient cultures have glyphs and tales of people in flying ships...many having no ability to communicate stories with eachother had identical tales... the Sumerians knew every planets location, what the planets looked like, their size etc. and their claims state the people from the sky told them...but that's a whole other topic

time is the perception...

I don't think it's possible to go back in time.. but perhaps you can leap ahead.. however you would be stuck there and have to wait for everyone else to catch up.... or you could leave a little message maybe under a rock... maybe on the rock... so-and-so was here... going back in time just too many problems... anybody smart enough to create a universe would not allow the possibility of this too..happen...

Every astronaut has done it. Good grief, don't you know ANYTHING about physics?

Here's a little quote from space.com ... a short explanation of what happens as we move faster and slow time.

"Einstein's theory of special relativity says that time slows down or speeds up depending on how fast you move relative to something else. Approaching the speed of light, a person inside a spaceship would age much slower than his twin at home. Also, under Einstein's theory of general relativity, gravity can bend time.

Picture a four-dimensional fabric called space-time. When anything that has mass sits on that piece of fabric, it causes a dimple or a bending of space-time. The bending of space-time causes objects to move on a curved path and that curvature of space is what we know as gravity.

Both the general and special relativity theories have been proven with GPS satellite technology that has very accurate timepieces on board. The effects of gravity, as well as the satellites' increased speed above the Earth relative to observers on the ground, make the unadjusted clocks gain 38 microseconds a day. (Engineers make calibrations to account for the difference.)

In a sense, this effect, called time dilation, means astronauts are time travelers, as they return to Earth very, very slightly younger than their identical twins that remain on the planet.
- See more at: http://www.space.com/21675-time-travel.html#sthash.KluUKSxk.dpuf"

Yes, gravity and perhaps motion can alter how a measuring device functions, and a clock is a measuring device.

You are just jealous because you are a Human instead of a Melmacian like me.