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In the July issue of Physical Review Letters, Amos Ori, professor of physics at the Technion, the Israel Institute of Technology in Haifa, argues that the laws of physics don't stand in the way of building a time machine.
Ori isn't the first physicist to create a theoretical time machine. Unlike previous models, Ori's proposal doesn't require any unknown matter or energy. The previous theories were forced to use unrealistic negative energy to warp space and time.
Ori's plan requires absolute emptiness, a vacuum. That means that, in principle, a closed, timelike curve could happen naturally, possibly through cataclysmic astronomical collisions in the abyss of space.
He adds that if inhabitants of some highly advanced civilization could set up the conditions he describes, they might be able to travel in time.