Travel Through Time

As a variation on the rotating cylinder, some scientists have suggested using “cosmic strings” to construct a time machine. At the moment, these are purely theoretical objects that might possibly be left over from the creation of the universe in the Big Bang. A black hole contains a one-dimensional singularity – an infinitely small point in the space-time continuum.
A cosmic string, if such a thing existed, would be a two-dimensional singularity – an infinitely thin line that has even stranger effects on the fabric of space and time. Although no one has actually found a cosmic string, astronomers have suggested that they may explain strange effects seen in distant galaxies.
By maneuvering two cosmic strings close together – or possibly just one string plus a black hole – it is theoretically possible to create a whole array of “closed timelike curves.” Your best bet is to fire two infinitely long cosmic strings past each other at very high speeds, then fly your ship around them in a carefully calculated figure eight. In theory, you would be able to emerge anywhere, anytime!

Interesting article from 2004:

Eight years ago, American and British scientists who conducted investigations in Antarctica made a sensational discovery. US physicist Mariann McLein told the researchers noticed some spinning gray fog in the sky over the pole on January 27 which they believed to be just ordinary sandstorm. However, the gray fog did not change the form and did not move in the course of time. The researchers decided to investigate the phenomenon and launched a weather balloon with equipment capable to register the wind speed, the temperature and the air moisture. But the weather balloon soared upwards and immediately disappeared.