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Late last month scientists working at NASA's Chandra X-ray Observatory announced that they had found proof of dark matter, the theoretical substance believed to make up more than a quarter of the universe.
But Glenn Starkman, a cosmologist at Case Western Reserve University in Cleveland, Ohio, is hitting back with a blast from the past. He argues that dark matter might not exist and that the long-discredited substance known as ether is actually what influences gravity in the cosmos.
The next phase in his research will be to perform more detailed calculations to make sure his ether theory matches up with empirical evidence, such as the motion of planets within the solar system.
"It's important to do these experiments, because either we'll be able to rule dark matter out or we'll increase our confidence in it.
"At this point I don't think we can rule out either of the two [competing] theories," he said.