NASA's Mars Curiosity rover had hardly touched down on the surface of the fourth planet from the sun when its cameras began sending back strange images - ones that some are calling evidence of unidentified flying objects, or UFOs.

One video (below) runs a particularly curious Curiosity image through a series of filters, revealing a number of UFO-type objects ... or whatever they are. Ever since the Mars Curiosity rover landed safely, theories have run rampant.

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