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NASA's Curiosity rover had hardly touched down on the surface of Mars on Aug. 5 when its cameras started transmitting images back to Earth of some odd things -- what some were calling UFOs.

In one instance of Martian weirdness, YouTube poster StephenHannardADGUK put a curious Curiosity image through a series of filters, revealing a number of UFO-type objects, or specks or blotches, in the sky above.

Digital artifacts, more than likely. To read more, click here.