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Top 25 cities for UFO sightings across the US

Are aliens real? All the evidence, sightings and conspiracy theories on their existence

'UFO' spotted over Yellowstone volcano?

'Alien megastructure' ruled out for some of star's weird dimming

Alien hunters discover 'UFO highway' across America

Kesha says she saw UFOs in the desert and it inspired a song on her new album

Alien ships near Saturn? Ex-NASA scientist claims of their existence

Stephen Hawking is deathly afraid of aliens

'Cosmic welcome mats' aim to bring aliens in

Mining complex on the moon? UFO hunter claims structures visible on lunar surface