Dark matter is a kind of matter in astronomy and cosmology to account for gravitational effects that appear to be the result of invisible mass. It was first theorised more than 70 years ago, but after decades of searching, scientists believe they have seen the first sign of elusive Dark Matter.
Researchers at EPFL's Laboratory of Particle Physics and Cosmology in Switzerland and Leiden University in The Netherlands have picked up unexpected signals coming from a cluster of galaxies in the constellation Perseus and in the Andromeda galaxy.
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