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I want to believe

Are we alone in the universe? It's a question that humanity has long grappled with. But while astronomers continue to scan the cosmos for signs of alien life, imaginations are free to run wild here on Earth. From pop stars to Hollywood actors to politicians, here are 13 famous people who believe in aliens.

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Winston Churchill

History remembers Winston Churchill for his political prowess and his leadership during a complex time in Britain's history, but a relatively unknown part of the statesman's legacy - one in which he confronted the idea of alien civilizations - was recently uncovered.

Churchill penned an 11-page essay on alien life in 1939, revealing his curiosity about the universe and outlining his definition of life and its most important ingredients.

"I, for one, am not so immensely impressed by the success we are making of our civilization here that I am prepared to think we are the only spot in this immense universe which contains living, thinking creatures," he wrote in the newly uncovered essay, "or that we are the highest type of mental and physical development which has ever appeared in the vast compass of space and time."

Churchill's essay was described in an article published in the journal Nature in February 2017.

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Khloe Kardashian

It can be hard keeping up with the Kardashians' exploits, but when it comes to aliens, at least one member of the famous family is a believer. In 2015, Khloe Kardashian saw strange lights in the sky and tweeted "Kendall and I are spazzing out!!!!!! #UFO."

Though the U.S. Navy later said the unusual lights were part of a pre-planned missile test, Kardashian stuck to her guns.

"What do we expect people to say? Obvi they are going to say it's a meteor shower. I'm such a conspiracy theorist let me enjoy this," she responded.

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Hillary Clinton

Hillary Clinton has a long political history advocating for children and families, gender equality and health care reform, but in 2016, during her bid to secure the Democratic nomination for president, Clinton turned her attention to the paranormal.

In a radio interview and then later on "Jimmy Kimmel Live," Clinton said she wants to review files about UFOs and the mysterious Area 51 site in Nevada and make them public.

"I would like us to go into those files and hopefully make as much of that public as possible," she told Kimmel. "If there's nothing there, let's tell people there's nothing there."

Area 51, located about 80 miles (130 kilometers) northwest of Las Vegas, in the Nevada desert, is a restricted military outpost that is part of the Edwards Air Force Base. It has been the site of a number of stealth military programs, and this secrecy has, in part, fueled conspiracy theorists who claim that scientists at the facility are reverse-engineering alien technology from UFO crashes. In 2013, declassified CIA documents detailed some of Area 51's history, revealing the site's role in testing spy planes such as the U-2. There was no mention of aliens or UFOs in the declassified files.