Do they come in peace? The question has hung over the UFO mystery forever, but a new study comes closer to an answer than ever before.

Since the United States detonated its first atomic bomb at the Trinity test site in 1945, dozens of accounts of UFOs have been logged by military witnesses and government scientists working with America's sensitive nuclear arsenal. 

Skeptics have often turned to questioning the veracity and the memories of these military witnesses, or blaming faulty equipment. 

But the connection between UFOs and nuclear sites has persisted in India, Russia and elsewhere across the globe, leading many to wonder: are aliens stopping us from exterminating ourselves?

Now a new, decades-long study has analyzed over 500 of the best supported UFO cases from the heights of the Cold War and hauntingly concluded: 'This intelligence understands atomics, and they understand atomic weaponry.'

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