
Game of two halves: Scientists solve Martian riddle
Paris (AFP) June 25, 2008 - For nearly 30 years, space scientists have wrestled with one of the greatest enigmas in the Solar System: why does Mars have two faces? Pictures sent back by the US Viking landers in the late 1970s unveiled Mars's northern hemisphere as an enormous lowland basin, where -- or so it was suspected -- a mighty ocean may have raged. But Mars's southern hemisphere is abruptly, bizarrely different.












