In the heart of a galaxy cluster 200 million light-years away, astronomers have failed to detect hypothetical particles called axions.
This places new constraints on how we believe these particles work — but it also has pretty major implications for string theory, and the development of a Theory of Everything that describes how the physical Universe works.
“Until recently I had no idea just how much X-ray astronomers bring to the table when it comes to string theory, but we could play a major role,” said astrophysicist Christopher Reynolds of the University of Cambridge in the UK.
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