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Nasa's rover lands on Mars today

AFP, Washington
Are we alone? Or was there life on another planet? Nasa's $2.5 billion dream machine, the Mars Science Laboratory, aims to take the first steps toward finding out when it nears Mars's surface today.
Scientists have found signs of water on Red Planet, which is Earth's neighbor, hinting that some form of life was once likely even though Mars is now a dry place with a thin atmosphere, extreme winters and duststorms.
Nasa said it will find out whether its Mars Science Laboratory and rover, Curiosity — designed to hunt for soil-based signatures of life and send back data to prepare for a future human mission - landed safely at 1:3 lam Eastern time today.
That will be about 14 minutes after the touchdown actually happens due to the time it takes for spacecraft signals to travel from Mars to Earth.
As of late Saturday, the laboratory was approximately 420,039 kilometers from Mars, closing in at around 8,000 miles perhour.
"Curiosity remains in good health with all systems
operating as expected," Nasa said in astatement.
The nuclear-powered rover is the biggest ever built for planetary exploration — weighing in at one ton, about the size of a small car -- and carries a complex chemistry kit to zap rocks, drill soil and testforradiation.
The landing is a daring and unprecedented maneuver that involves penetrating the atmosphere at a speed of 13,200 miles per hour, slowing down with the help of a supersonic parachute and dropping down gently with tethers from a rocket-powered sky cran e.
Two NASA orbiters will be crossing overhead as the lander approaches the surface, and a third orbiter operated by the European Space Agency will also send databack to Earth.
The Mars Science
Laboratory began its journey more than eiglit months ago when it launched from the Florida coast in late November2011.
"It gets scarier every day," said McCuistion, noting that only about 40 percent of past attempts by global space agencies to send spacecraft to Mars have succeeded.
Nasa has detailed the final minutes of the complex landing in an Internet video called "Seven Minutes of Terror."
A live broadcast from mission control in Pasadena, California will be on www.nasa.gov beginning at 0330 GMT today.
The landing site for the rover is a flat area known as Gale Crater, which lies near a mountain that scientists hope the rover will be able to climb in the search for sediment layers that could be up to a