Mars Planet

Talk about your cosmic pileups. An asteroid similar to the one that flattened forests in Siberia in 1908 could plow into Mars next month, scientists said Thursday. Researchers attached to NASA's Near-Earth Object Program, who sometimes jokingly call themselves the Solar System Defense Team, have been tracking the asteroid since its discovery in late November. The scientists, at the Jet Propulsion Laboratory in La Canada Flintridge, put the chances that it will hit the Red Planet on Jan.

Mysterious debris fields found far from the poles on Mars were made by glaciers, possibly formed just like glaciers are on Earth -- by the buildup of snow, researchers from Brown University reported Friday in the journal Science. The glaciers would have resembled those found on Earth in places such as Mt. Kilimanjaro in Africa or the Andean peaks in South America, the researchers said, and probably formed when Mars was tilted on its side five million years ago.

The Mars rover Spirit has hit a home run by landing in a rugged plateau dubbed "Home Plate," but scientists are still trying to decipher its geology. The six-wheeled Spirit reached the northern edge of the broad mesa last week about four months after climbing down from a Martian hill as tall as the Statue of Liberty. Scientists believe "Home Plate" -- which stands about 6 feet high -- holds important geologic clues to the Red Planet's past. Scientists say they are puzzled by what they have seen.

NASA's Mars Reconnaissance Orbiter is on course and in apparently good condition as it nears the Red Planet on a search for water and future landing sites, officials said. The spacecraft, scheduled to enter orbit around Mars on March 10, is expected to examine the planet in unprecedented detail. In addition to cameras that should be able to see the two Martian rovers on the planet, its radar can spot underground features 50 feet across, such as a water basin.

After a seven-month, 310-million-mile journey, NASA's Mars Reconnaissance Orbiter executed a risky braking maneuver Friday, slipping into an elongated orbit around the Red Planet that should eventually allow it to record the surface in unprecedented detail. "It's right on the money!" cheered one mission controller at the Jet Propulsion Laboratory in La Canada Flintridge after confirming the craft survived a 27-minute engine burn.

First there was Google Earth, then Google Moon. Now Google Inc. has expanded its galactic reach by launching Google Mars, a Web browser-based mapping tool that gives users an interactive view of the Red Planet with the click of a mouse. The Martian maps, at www.google.com/mars, were made from images taken by NASA's Mars Odyssey and Mars Global Surveyor orbiters.

NASA's Mars Reconnaissance Orbiter sent back its first images of the Red Planet's surface on Friday -- high-altitude test shots that scientists say are as good as any orbital images previously returned to Earth. One image covers an area in Mars' mid-latitude southern highlands about 1.6 miles long and 1.3 miles wide. The smallest objects visible in the image are about 27 feet across, a much lower resolution than will be obtained when the satellite reaches its final orbit.

The Mars rover Spirit has lost power in one of its six wheels, slowing its trek toward a slope where the solar-powered vehicle should catch enough sunlight to keep operating through the Martian winter. It wasn't clear why Spirit's right front wheel stopped working. Because the wheel was drawing no power, engineers at NASA's Jet Propulsion Laboratory in La Canada Flintridge speculated that the problem was a broken electrical wire or malfunctioning motor.

The Mars rover Spirit, hampered by a broken wheel, has failed to reach its destination and will spend the Martian winter at an alternate site, scientists said Monday. After failing three times to get it to climb McCool Hill, engineers steered Spirit to a closer slope, where it arrived over the weekend, said principal scientist Steve Squyres of Cornell University. The new site should provide enough sunlight for Spirit, but the light won't be as strong as it would have been on McCool Hill.

Today's cold, dry climate on Mars evolved about 3.5 billion years ago, ending a period when that planet had seen moist conditions, research indicates. An international team of scientists developed a timeline for Mars' geological evolution, reporting in Friday's issue of the journal Science that the planet had three distinct eras.