Alpha Centauri 2

Community => Recreation Commons => Destination: Alpha Centauri => Topic started by: Buster's Uncle on February 15, 2014, 08:47:07 pm

Title: NASA solves mystery of Mars 'doughnut' rock
Post by: Buster's Uncle on February 15, 2014, 08:47:07 pm

NASA solves mystery of Mars 'doughnut' rock
AFP
2 hours ago


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NASA image shows before-and-after of the same patch of ground in front of NASA's Mars Exploration Rover Opportunity 13 days apart documenting the arrival of a bright rock onto the scene, on January 22, 2014 (AFP Photo/)



Chicago (AFP) - NASA scientists were finally able to explain the origin of the mysterious rock shaped like a jelly doughnut that appeared near the rover Opportunity in early January.

The small, round object suddenly popped up in pictures taken 12 days apart by the US space agency's decade-old Opportunity rover.

On December 26, 2013, it was not there. On January 8, it was. But what is it?

The explanation is somewhat prosaic: the 1.5 inches (four centimeters) wide, white-rimmed, red-centered rock, dubbed Pinnacle Island, is a piece of a larger rock that was broken and moved by Opportunity's wheel in early January.

"Once we moved Opportunity a short distance, after inspecting Pinnacle Island, we could see directly uphill an overturned rock that has the same unusual appearance," said Opportunity Deputy Principal Investigator Ray Arvidson of Washington University in St. Louis on Friday.

"We drove over it. We can see the track. That's where Pinnacle Island came from."

The rock however is unusual.

A close examination with Opportunity’s spectrometer showed "high levels of elements such as manganese and sulphur, suggesting these water-soluble ingredients were concentrated in the rock by the action of water," NASA said.

"This may have happened just beneath the surface relatively recently," Arvidson said, "or it may have happened deeper below ground longer ago and then, by serendipity, erosion stripped away material above it and made it accessible to our wheels."

Opportunity is one of two Mars Exploration Rovers. Its companion, Spirit, stopped communicating with Earth in 2010.

Both have lived long beyond their planned 90-day missions and have made important discoveries about water on Mars and environments that might have supported microbial life in the distant past.


http://news.yahoo.com/nasa-solves-mystery-mars-39-doughnut-39-rock-180301845.html (http://news.yahoo.com/nasa-solves-mystery-mars-39-doughnut-39-rock-180301845.html)

Title: NASA's 'Jelly Doughnut' Mars Rock Mystery Solved
Post by: Buster's Uncle on February 15, 2014, 11:57:37 pm

NASA's 'Jelly Doughnut' Mars Rock Mystery Solved
SPACE.com
by Miriam Kramer, Staff Writer  February 14, 2014 6:04 PM


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This image from the panoramic camera on NASA’s Mars Exploration Rover Opportunity shows where a rock called "Pinnacle Island" had been before it appeared in front of the rover in early January 2014. This image was taken on Feb. 4, 2014.



Scientists have solved the mystery of the strange "jelly doughnut" rock on Mars.

NASA's Opportunity rover spotted an odd Martian rock that looked like a doughnut on Jan. 8. Four days earlier, however, the rock wasn't there at all. So how did the rock appear? Alien rock throwers? A nearby meteorite impact?

The truth is much less surprising. Scientists working with the intrepid robot have just confirmed that the rock (called Pinnacle Island) was simply kicked up by one of Opportunity's wheels as it made its way across the planet's surface. [Amazing Photos from NASA's Opportunity Mars Rover]

"Once we moved Opportunity a short distance, after inspecting Pinnacle Island, we could see directly uphill an overturned rock that has the same unusual appearance," Opportunity deputy principal investigator Ray Arvidson, of Washington University in St. Louis, said in a statement. "We drove over it. We can see the track. That's where Pinnacle Island came from."

The rock stirred up enough controversy that a concerned citizen even filed a lawsuit against the space agency, claiming that NASA failed to properly investigate a possible fungus growing on the Red Planet.

Although researchers figured out where the rock came from, there are other weird aspects of the Pinnacle Island tale. Using Opportunity's tools, mission scientists have discovered that the rock has very high levels of sulfur and manganese. Both of those elements are water-soluble, suggesting that they were concentrated in the rock due to the "action of water," NASA officials said.


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The boulder-studded ridge in this scene recorded by NASA's Mars Exploration Rover Opportunity is "McClure-Beverlin Escarpment." This view toward the south is a mosaic of images taken by Opportunity's panoramic camera (Pancam) on Dec. 25, 2013.


"This may have happened just beneath the surface relatively recently, or it may have happened deeper below ground longer ago and then, by serendipity, erosion stripped away material above it and made it accessible to our wheels," Arvidson said.

The rock is located in a spot on "Murray Ridge" along the wall of Endeavour Crater, where Opportunity is spending the Martian winter. Now that the rover is done examining Pinnacle Island, the Opportunity team is planning to drive the rover uphill to check out exposed rock layers on a different part of the Martian surface.

"We are now past the minimum solar-energy point of this Martian winter," Opportunity project manager John Callas, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., said in a statement. "We now can expect to have more energy available each week. What's more, recent winds removed some dust from the rover's solar array. So we have higher performance from the array than the previous two winters."

Opportunity has been exploring Mars since 2004, landing on the Red Planet a few weeks after its twin, Spirit, touched down on the Martian surface. Both rovers were assigned 90-day missions, but Spirit gathered data until 2010 and Opportunity is still roving along.


http://news.yahoo.com/nasa-39-39-jelly-doughnut-39-mars-rock-230427533.html (http://news.yahoo.com/nasa-39-39-jelly-doughnut-39-mars-rock-230427533.html)