Recently, some discoveries have been made that have been so strange and mysterious that they have been thought to be of extraterrestrial origin. One of the most famous of these discoveries is the Wow! signal. In 1977, a radio telescope detected a strong signal that lasted for 72 seconds. It was so strong that it was thought to be of extraterrestrial origin, and it has been the subject of much speculation ever since.
Another mysterious discovery is the Tunguska event. In 1908, a huge explosion occurred in Siberia, flattening trees and causing a shockwave that was felt hundreds of miles away. The cause of the explosion is still unknown, and some have speculated that it could have been caused by an alien spacecraft. Finally, there is the mysterious object Oumuamua. In 2017, an object was detected passing through our solar system that was unlike anything seen before. It was thought to be an interstellar comet, but its strange shape and trajectory have led some to speculate that it could be an alien spacecraft.
These discoveries have all been fascinating and mysterious, and have led to much speculation about the possibility of extraterrestrial life. While none of these discoveries have been definitively proven to be of alien origin, they have certainly been intriguing and have sparked the imaginations of many.