A mysterious green ripple in the sky over Hawaii has flummoxed the government and military, but a rare atmospheric phenomenon ...

After a long, winding road of tests, researchers at the Smithsonian’s National Museum of Natural History and other ...

Scientists have solved the mystery of a "golden orb" found thousands of feet underwater by researchers from the National ...

In the past three years, astronomers have discovered a mysterious new type of radio source. We call these long-period transients. These objects emit bright radio signals that repeat every few minutes ...

There’s more than one type of skyscraper above Manhattan. The mysterious orb caught on video zooming over the Hudson River is just the latest “UFO” incident in the Big Apple, even though the densely ...

Mysterious flying objects overhead. Concern and confusion. And calls for military intervention. This isn't the plot of "War of the Worlds," but rather the result of numerous possible drone sightings ...