Signs of recent liquid water on Mars may have instead been caused by
mini-avalanches of dirt. In December, NASA released photos of Martian
gullies that showed enigmatic tracks of material suddenly appearing
in the last five years. Researchers interpreted the deposits as
having possibly come from trickling water.
The problem with that theory is that such features can be reproduced
in the lab by letting small particles slide away, says granular
materials researcher Troy Shinbrot of Rutgers University. "You find
that every single thing that geologists say, 'Ah, that means there's
water,' you can duplicate," says Shinbrot, who described his research
on sliding grains at this week's meeting of the American Physical Society here.
Posted By johannes to
at 3/06/2007 12:39:00 PM
Bagasch mailing list