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The latest findings, made by comparing photos taken by a camera aboard NASA's Mars Global Surveyor spacecraft, were announced yesterday.
Placing photographs side by side, researchers at the company discovered mysterious gullies appearing on the walls of sand dunes in less than three years, tracks from boulders that had tumbled down the steep wall of a crater between November 2003 and December 2004, dramatic melting of ice at the south pole over three consecutive martian summers, and even a meteorite crater that hadn't existed 20 years ago.
The boulder tracks have particularly interested scientists. Exactly what may have shaken the boulders loose is unclear. Strong winds could have dislodged them, but researchers yesterday said they couldn't rule out a "marsquake."