Curiosity has been on Mars for 51 sol-days and today NASA announced
it has found what looks like
a concrete slab made up of rounded stones which is probably
an ancient stream bed
formed by hip-deep fast-moving water over thousands or millions of years. Observers have long hypothesized the canyons and river-like beds photographed from space were carved by water, but only now do researchers have on-the-ground confirmation for the first time.
posted by stbalbach
on Sep 29, 2012 -