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    A Weird Rock Just Appeared Out Of Nowhere On Mars

    Martians, a meteorite impact, or a more boring explanation?

    A rock has apparently appeared out of nowhere a few feet away from the Opportunity rover on Mars.

    It's about the size of a jelly doughnut. It was a total surprise, we were like 'wait a second, that wasn't there before, it can't be right. Oh my god! It wasn't there before!' We were absolutely startled.

    In Nasa's tradition of naming rocks its Mars rovers encounter, this one has been dubbed "Pinnacle Island".

    Explanations for the rock's sudden appearance include a nearby meteorite impact or, more likely, that the rover somehow flipped the rock when it moved. NASA said in an update that the rock and its origins "will likely be the target of considerable investigation over the next few days".

    Opportunity has been on the red planet since 2004.