ANITA Anomaly
The Antarctic Impulsive Transient Antenna or ANITA has been getting a lot of important data for years. This is actually a high-altitude balloon that was designed specifically to detect ultra-high-energy neutrinos that come from outer space. It was launched in the Summer of 2006 and currently sits at 37,000 meters from the surface of the Earth. While the antenna is designed to detect things from outer space, it actually began to pick up a strange signal sometime in 2016 that seemed as if it was coming from beneath the ice in Antarctica. That started the wild adventure that made this one of the biggest cosmic mysteries today!
Twice in 2016, a high-energy particle seemed to burst out of the ice, which tripped detectors on the antenna above. Somehow, the particles went through the entire Earth without a scratch. One would assume this would not make sense, which is true. None of the known particles could make that trip at a high-energy level. Physicists are still trying to figure it all out. In fact, some have even chalked it up to an illusion. However, one study seems to have the best possible explanation: sub-surface firn. It adds up, as this fits everything that could cause such an anomaly.