"Meteors not water coloured Mars"
Hot off the presses from EurekAlert: http://www.eurekalert.org/pub_releases/2003-09/ns-mnw090303.php
WHY is Mars red? The generally accepted explanation that liquid water rusted its rocks may be wrong. Lab experiments that mimic the environment on Mars suggest that the planet's reddish hue came from a dusting of tiny meteors falling on the surface.