Are there aliens among us? A recent tweet by American astronaut Scott Kelly has UFO enthusiasts buzzing about the possibility.
In his post dated Nov. 15, Kelly, who has spent more time living in space than any other U.S. astronaut, shared a breathtaking image of southern India taken from the International Space Station.
But many social-media users seemed more interested in an object at the top right corner of the photo.
Could it be a UFO? Probably not, theoretical physicist Michio Kaku told CBS News.
"It could be a reflection off someone's windshield, or it could be almost anything," Kaku said.
Although there has been no comment from NASA, other Twitter users said the object appears to be a part of the International Space Station.
>> Click here to see what people were saying on social media
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