This was new to me...
"Physics Professor Ronald Mallett discussed his breakthrough research on time travel, which is based on Einstein's theories of relativity. "If we can control gravity with a device, then we can actually control time, as well, and that could lead to a machine," he said. The force of gravity is actually the bending of empty space, and the energy of light can create gravity, therefore light can potentially manipulate time, he explained.
Mallett's idea for a machine involves using a circulating light beam with a series of mirrors, that can twist empty space. According to Einstein, if you bend space, then you bend time. "If I twist space, I can twist the line of time into a loop," connecting the past to the future, he said. When a person travels back to the past, they will have altered the past, so the future may not play out in the way the way it originally did. This is known as the 'Butterfly Effect' where some little thing leads to a chain of reactions that alters the future, he detailed."
Picture is not from article but from Dreamtime..
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