Scientists working on a NASA program in Antarctica reportedly observed a phenomenon which could be evidence of the existence of a parallel universe.
The program which led to this discovery in 2016 is called ANITA, or Antarctic Impulsive Transient Antenna, which intended to study subatomic “ghost” particles that come from space by launching a balloon with antennae, taking advantage of the dry and relatively interference-free air above Antarctica.
The particles, called neutrinos, can be relatively low or high energy. If the former, they can actually pass through the solid matter of the earth entirely, but if the latter, they cannot. This means that high-energy neutrinos, known as tau neutrinos, would only ever be expected to be detected coming down from space.
However, what the researchers found which astounded them was tau neutrinos actually coming up from the earth. This incredibly rare and “billion-to-one” event might happen once, but it was observed several times, leaving scientists with limited possible explanations.
One explanation, fantastical as it may seem, which was seriously proposed as a result was the possibility that these particles were from a parallel universe and traveling backward in time, explaining why they were observed coming up from the earth into space despite originating from space and being unable to pass through the planet.
This potential parallel universe, which would have been created in the Big Bang along with ours, is described as being a mirror image where everything, from our perspective, would be backwards: right and left, positive and negative, and the direction of time. To inhabitants of that universe, ours would likewise be running backwards.
This hypothesis was apparently seriously entertained according to published reports detailing the results of the NASA study. However, even supportive researchers noted that it was controversial and not accepted by all, though there have also been voices of favorability.