The Lunar Anomalies - strange structures and formations on the Moon that have been observed by some researchers but are not fully understood.
The Pioneer Anomaly is an unexplained deviation in the path of the Pioneer spacecraft.
The Tunguska Event - a massive explosion in 1908 over Siberia, believed by some to have been caused by a meteorite or extraterrestrial object.
Dark Matter and Dark Energy - are mysterious substances that make up most of the universe but have never been directly observed or fully understood.
The "Wow!" Signal - a radio signal detected in 1977 that has never been fully explained and is still a mystery.
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