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
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