Gravity doughnut promises time machine

[emad]

Mark Peplow
Movement into the past gets one step less improbable.


One of the major difficulties of travelling backwards in time has just been solved, according to an Israeli theoretical physicist. And the solution, he says, is doughnut-shaped.

Trips in time have been theoretically possible ever since Einstein worked out that heavy masses can warp both time and space, and that objects travelling close to the speed of light tend to experience the passage of time more slowly.

Moving forwards in time is therefore easy. Certain short-lived cosmic particles, for example, can be seen on Earth. Their journey looks to us as if it has taken thousands of years, but the particle feels as though it has whipped across space in just a few minutes, and arrives on Earth before it has had time to decay. In effect, the particle has travelled into the future, living beyond its years.

But getting back to the past is more problematic. Researchers thought you would need all kinds of strange things to do this, including a neutron star (which we know to exist), worm holes (which we don't), and a kind of exotic matter that we can only imagine.
http://www.nature.com/news/2005/050711/full/050711-4.html

[Drifter]

1. Isn't that like saying ....

That I am closer to reaching the moon, by getting on a step ladder.

Cheers
Drifter

[Deja Q]

2. Good. Now the neocons can conquer the entire history of Earth...

And tell the Greeks homosexuality is a siiiiiiiiiiiiiiiiiin before telling the Romans to sic 'em...