NASA has clarified the origin of a mysterious stone to Mars. Apparently, everything is much more boring than hoped.

The U.S. space agency Nasa has solved the riddle of a mysterious stone that had suddenly appeared on pictures of the Mars robot "Opportunity" . How NASA announced that the in shape reminiscent of a donut stone was pushed by a wheel of the rover to the attention of the camera. The pictures of the strange structure had caused a worldwide guesswork .
The about four inches large stone was apparently surfaced in January out of nowhere on the rocky ground next to " Opportunity" . Twelve days earlier, on the site of anything yet located, as it was then captured images showed .
According to NASA, the official " Pinnacle Iceland " came called stone, white outside and colored inside dark red, of a similar chunk in the vicinity. Thus he became replaced by the six-wheeled robot itself .
After "Opportunity" was set back a bit , was a converted stone ejected been seen " by the same unusual phenomenon ," said Ray Arvidson of Washington University in St. Louis, participating in the "Opportunity " program. "We are driven over it . , We can see the track. "
Although the explanation is mundane , the stone remains uncommon. The spectrometer of "Opportunity" have " a high level of manganese and sulfur " measured , reports NASA . These water-soluble constituents seemed to indicate " that they were concentrated in the stone by the activity of water."