They are not telling us everything - are they ?
If this was flying, it would be a UFO. It is too small for a human to travel in it. It could be a Drone / remote controlled observation platform - or maybe the ones who were flying it are so small they could comfortably fit in it, like one of the races on Mars or the ones who left a perfect human skeleton in Fossilized form in Antarctica. You can see their pictures in this Photo Gallery. Like the saying goes, "I do not say it is a UFO, but it is a UFO"