Scientists claim to have new evidence that may show proof of an ‘anti-universe’ or ‘mirror universe’ in which time has been running backward alongside us since the Big Bang.
Its potential existence could also explain dark matter in our own universe - which has long been an area of mystery for physicists.
This anti-universe would be entirely the same as ours, but due to the particles that make up its existence, time would be running in the opposite direction.
The 'anti-universe' theory is reportedly based on the CPT theorem - which assumes that charge, parity and time are symmetrical and that if you switch these in any physical interaction, they will behave the same.
The existence of this mirror universe therefore could help explain dark matter, according to a report by Live Science.
There are three known types of neutrinos: the electron-neutrino, muon-neutrino and tau-neutrino, all of which spin in the leftward direction.
A neutrino is a subatomic particle similar to an electron and are one of the most abundant particles in the universe.
Since all other particles are known to have both leftward and rightward spins, physicists have spent years researching if there could be right-spinning neutrinos.
A mirror-image universe would ensure the presence of these neutrinos that spin to their right - and this would back up the idea of an entirely mirrored effect.
There would be absolutely no way to access this anti-universe because it existed before the big bang however scientists have said they can still test the hypothesis - and plan to do so.
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