After Facebook users planned to "storm" Area 51 in search of alien life, the US Air Force...
More about 'ufo'
The US Air Force is warning people to stay away from Area 51 after a viral Facebook joke to storm the base and 'see them aliens'
Ellen Ioanes, Business Insider US
US senators reportedly got a classified briefing on UFOs after Navy pilots reported seeing spherical objects flying at 'hypersonic speed'
In April the US Navy reported that there had been an increase in the number of sightings...
Tom Porter, Business Insider US
Donald Trump says he's been briefed about UFOs but remains skeptical
Interest in UFOs has flared in recent months, and US President Donald Trump says he's had...
Christopher Woody, Business Insider US
10 flying objects people have mistaken for alien spaceships
Of these, the Roswell incident might be the most famous.
Sean Kane, Business Insider US