What do you think? This triangle-shaped dark spot on the moon is believed to be a UFO. What do you think? This triangle-shaped dark spot on the moon is believed to be a UFO. What do you think? This triangle-shaped dark spot on the moon is believed to be a UFO. What do you think? This triangle-shaped dark spot on the moon is believed to be a UFO. What do you think? Click through the slideshow to learn more about UFO sightings across the world. Click through the slideshow to learn more about UFO sightings across the world.

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