Researchers discovered an unknown anomaly roughly five times the size of Hawaii’s largest island. The mass is sitting beneath one of the largest preserved craters in the solar system, the South Pole-Aitken basin. A plausible guess by scientists: The mass is a piece of metal left behind nearly 4 million years ago by the asteroid that formed the crater. The mysterious mass sits more than 300 km (186 miles) underneath the solar system’s largest crater. The crater isn't visible to the naked eye because it's on the far side of the moon, which always faces away from Earth.

Source: Forbes June 10, 2019 23:15 UTC