Spirit surveys its own predicament. The bright soil pictured left is loose, fluffy material churned by the rover’s left-front wheel as Spirit, driving backwards, broke through a darker, crusty surface. At right is the least-embedded of the rover’s six wheels.

Homer’s Iliad tells the story of Troy, a city besieged by the Greeks in the Trojan War. Today, a lone …

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Why Did Mars Dry Up?

Once upon a time – roughly four billion years ago – Mars was warm and wet, much like Earth. Liquid water flowed on the Martian surface in long rivers that emptied into shallow seas. A thick atmosphere blanketed the planet and kept it warm. Living microbes might have even arisen, some scientists believe, starting Mars down the path toward becoming …

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Dense clusters of crack-like structures called deformation bands form the linear ridges prominent in this image from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter. (Credit: NASA/JPL-Caltech/Univ. of Arizona)

NASA’s Mars Reconnaissance Orbiter has revealed hundreds of small fractures exposed on the Martian surface that billions of years ago directed flows of water through underground …

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Camera On Mars Orbiter Snaps Phoenix During Landing

A telescopic camera in orbit around Mars caught a view of NASA’s Phoenix Mars Lander suspended from its parachute during the lander’s successful arrival at Mars Sunday evening, May 25.

The image from the High Resolution Imaging Science Experiment (HiRISE) on NASA’s Mars Reconnaissance Orbiter marks the first time ever one spacecraft …

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NASA’s Phoenix spacecraft landed in the northern polar region of Mars Sunday to begin three months of examining a site chosen for its likelihood of having frozen water within reach of the lander’s robotic arm.

Radio signals received at 4:53:44 p.m. Pacific Time (7:53:44 p.m. Eastern Time) confirmed the Phoenix Mars Lander had survived its difficult final descent and touchdown …

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NASA’s Mars Odyssey spacecraft has discovered entrances to seven possible caves on the slopes of a Martian volcano.

NASA’s Mars Odyssey spacecraft has discovered entrances to seven possible caves on the slopes of a Martian volcano. The find is fueling interest in potential underground habitats and sparking searches for caverns elsewhere on the Red Planet.

Very dark, nearly circular features …

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False-color image of gully channels in a crater in the southern highlands of Mars, taken by the High Resolution Imaging Science Experiment camera on the Mars Reconnaissance Orbiter.

NASA’s Mars Reconnaissance Orbiter (MRO) is examining several features on Mars that address the role of water at different times in Martian history.

Features examined with the orbiter’s advanced instruments include material …

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Two months after sky-darkening dust from severe storms nearly killed NASA’s Mars exploration rovers, the solar-powered robots are awake and ready to continue their mission. Opportunity’s planned descent into the giant Victoria Crater was delayed, but now the rover is preparing to drive into the half-mile diameter crater as early as Sept. 11.

Spirit, Opportunity’s rover twin, also survived the …

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By the time you finish reading this sentence, you’ll be 25 miles closer to the planet Mars.

Earth and Mars are converging, and right now the distance between the two planets is shrinking at a rate of 22,000 mph–or about 25 miles per sentence. Ultimately, this will lead to a close approach in late December 2007 when Mars will outshine …

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Having explored Mars for three-and-a-half years in what were missions originally designed for three months, NASA’s Mars rovers are facing perhaps their biggest challenge.

For nearly a month, a series of severe Martian summer dust storms has affected the rover Opportunity and, to a lesser extent, its companion, Spirit. The dust in the Martian atmosphere over Opportunity has blocked 99 …

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