Time's arrow may make U-turns in universe

The new millennium, or at least the new year, begins. Yet somewhere in our universe, the year 2000 may have just receded into the future, new research suggests.

Imagine a renegade world where in Reversed-Times Square, the ball moved up the tower last night instead of down and where calendars flipped back to Dec. 31, 1999, instead of ahead. Such time inconsistency from one world to another could occur even in our own galaxy, proposes Lawrence S. Schulman of Clarkson University in Potsdam, N.Y.

"The actual appearance of this [opposite-directed time] in our universe is something we would have to see by observation. The only thing I'm saying, theoretically, is it's not ruled out," Schulman explains.

"Time is an extremely important but very difficult field of research," notes David T. Pegg of Griffith University in Brisbane, Australia. Although Schulman investigates concepts that may "seem like total science fiction," Pegg says, he "makes some real progress."

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