Conspiracy theories involving extraterrestrial life and UFO sightings predate the rise of the internet -- but social media has definitely played a role in spreading fodder for such theories. Watch below for some of the most convincing UFO sightings out there and more extraterrestrial curiosities.
An unusual sight was seen in Philadelphia skies on Sunday. Hector Garcia captured what appears to be a small, cloud-like mass floating just above the rooftops in the Tioga neighborhood. While some have speculated on the possibility of a UFO, other explanations raised include a big bag, weird cloud, and soap suds, according to the Huffington Post.
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