INTERNATIONAL SPACE STATION — NASA astronaut Scott Kelly posted a photo of a UFO to his Twitter account, and alien theorists are having a field day.

Kelly is spending a year in space on the International Space Station as part of NASA's Twins Study. He frequently posts photos of Earth taken from orbit, but on Day 233 of his journey, his photo featured mysterious lights in the upper right-hand corner.

Scott Waring, editor of blog site UFOsightingsdaily.com, told the Daily Express: "When an astronaut tweets a photo of a UFO, you can bet people notice it. It looks like Scott was trying to hint at the existence of aliens. Message received Scott, and thanks."

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