Disclosing government documents about UFOs won't mean much without hard physical evidence for alien spaceships or alien bodies.

Scientists who once rolled their eyes at flying saucer stories are now treating strange things in the sky as a serious research problem, not a punchline. Across government, academia and private ...

Donald Trump’s pledge to release official files relating to UFOs has intrigued conspiracy theorists who suspect the US government has hidden evidence of alien activity on Earth.