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Mars rover stalks mystery space alien object

Droid crawler in thrilling chase vs. (immobile) 'cobble'

The smart choice: opportunity from uncertainty

NASA's interplanetary robot rover "Opportunity", prowling the haematite steppes of the Meridiani Planum on Mars, has crept up on and photographed a mysterious space boulder or "cobble". Astro boffins theorise that the object may be alien in origin, rather than from the red planet.

Block Island pictured by NASA rover Opportunity

Alien robot meets extramartian space boulder.

The boulder/cobble was originally spotted by NASA boffins in charge of the rover on July 18. However, Opportunity had by that point driven well past the object, codenamed "Block Island" by NASA. The droid rover, which moves at a crawl, has since been laboriously creeping some 250m back on its tracks to get a proper look at the possible space rock.

The space agency has now released close-up pics of "Block Island" (more here) and says that there are plans to confirm its alien extra-Martian origin by use of Opportunity's alpha-particle X ray spectrometer. Personally, we here on the Reg space desk are hoping it turns out to be a cryptic "nanodiamond" from the mysterious ureilite mother-planetoid, like the pieces discovered in the Nubian desert here on Earth recently.

Meanwhile, Opportunity's companion rover Spirit remains bogged down in a sand trap in the Gusev crater on the other side of the red planet. NASA brainboxes are engaged in a lengthy series of trials using a test rover in a sandbox on Earth, attempting to figure out a way of getting the trapped droid moving again.

Both Spirit and Opportunity have, however, continued to operate many times longer than they were expected to. NASA engineers originally thought that the Mars-prowling machines might manage to travel as much as a kilometer from their landing sites over lifetimes measured in months. In fact both machines remain in operation well over 5 years from landing. Opportunity has moved more than 17km as of the last update, and Spirit almost 8km.

NASA now plans to despatch a new, much larger - Humvee sized - nuclear powered rover (called the Mars Science Laboratory or MSL) to the red planet in 2011, following development and funding problems. The MSL had originally been planned to launch later this year. ®

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