Well, now the mystery is solved. “Once we moved Opportunity a short distance, after inspecting Pinnacle Island, we could see directly uphill an overturned mineral that has the same unusual appearance,” said Ray Arvidson of Washington University. “We drove over it, we can see evidence of the track, but now we have this gelatinous material clogging up the tracks of the Mars explorer.”
No, he didn’t really say that. But the Mars explorer did return another photograph that has scientists scratching their heads … Any ideas about this one?