Scientists have unveiled a new theory on the birth of the cosmos, suggesting the early universe was shaped by an ancient particle that has been overlooked for decades.

Their research tackles one of the greatest conundrums in modern physics—how matter triumphed over antimatter in the aftermath of the Big Bang.

According to current theories, both should have annihilated each other after a colossal explosion, leaving nothing but an empty universe of pure energy. But physicists at the University of Southampton and the Indian Institute of Technology Kanpur say they found a clue in a neutrino, one of the lightest particles in the universe.