PASADENA, Jan 26: Nasa scientists said they hit a "scientific jackpot" on Sunday as Opportunity, the second of two roving US Mars probes, transmitted astonishing images from the planet's surface.

The 820-million-dollar mission's scientific director, Steve Squyres, was left gasping for words as Opportunity sent back to Earth pictures of what he described as an "alien landscape."

"I am flabbergasted, I'm astonished, I'm blown away," the 47-year-old scientist said at the National Aeronautic and Space Administration's Jet Propulsion Laboratory here.

The pictures enlivened scientists who continued working to repair the mission's first robotic probe, Spirit, which started communicating with NASA again Friday, two days after a worrisome communications breakdown.

Opportunity's black-and-white and color pictures showed that it landed near a rock outcropping that seemed very promising to geologists in the Mars Exploration Rover mission.

"This is the first rock outcrop ever found on Mars," Squyres, a professor at Cornell University in New York state, said in a news conference during which he was visibly excited. "Opportunity has touched down in a bizarre, alien landscape."

The rock outcropping is scientifically invaluable because, unlike stones that can come from elsewhere, they are historically linked to their location, he said.

To Squyres, who conceived the idea for the mission in 1987, the rover's success is the culmination of 16 years of work. In 2000, NASA picked him to lead the mission's scientists and to choose the instruments the rovers would need.

"It was exactly what it was in my wildest dream," said Squyres, who heads a group of more than 180 researchers. Opportunity landed safely on Mars on Sunday at 0505 GMT in a small crater in an area known as the Meridiani Planum, and approaching the nearby rock outcropping will be one of the rover's first objectives.

"We are lucky," said Larry Soderblom, of the US Geological Survey, calling the mission a "scientific jackpot." "It is difficult to find a place safe enough to land and expecting to find something interesting when you get there," he said.

The Meridiani Planum is a zone of grey hematite, an iron oxide. Scientists plan to use the robot's instruments to determine whether the grey hematite layer comes from sediments of a former ocean, from volcanic deposits altered by hot water or from other ancient environmental conditions.

"We could spend most of the mission just in this little crater," the mission's scientific director Steve Squyres said at NASA's Jet Propulsion Laboratory here.-AFP

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