NASA Envisions Mars with Water

A new NASA video shows what Mars may have been like long ago when it had a denser atmosphere and liquid water. The concept is based on evidence that Mars was once very different. "There are characteristic dendritic structured channels that, like on Earth, are consistent with surface erosion by water flows,” said Joseph Grebowsky of NASA's Goddard Space Flight Center in Greenbelt, Maryland. “The interiors of some impact craters have basins suggesting crater lakes, with many...

© La Voix de l'Amérique - jeudi 14 novembre 2013