Mars once covered in water, space agency says - CNN.com

By the CNN Wire Staff

June 25, 2010 10:42 a.m. EDT

Lyot crater is 210km in diameter - the asterisks show the locations where hydrated minerals were detected.

STORY HIGHLIGHTS

• Liquid water was once widespread over Mars, scientists say
• Evidence was discovered by NASA and the European Space Agency
• It shows water once existed in the northern hemisphere
• Evidence of water previously had been found only in southern areas