The Spirit rover on Mars has found a sulfur-infused rock that gives the most compelling evidence yet of how water affected the planet's surface, while the European Space Agency's orbiting probe has photographed proof of an underground frozen sea.
NASA celebrated the successful landing of its second rover, Opportunity, Saturday night on the opposite side of Mars from its twin rover, Spirit.
NASA's rover Spirit has failed to transmit data from Mars for more than 24 hours in what mission scientists thought at first was a weather-related interruption but now believe could be a serious hardware or software problem.
President Bush announced plans Wednesday to develop a new spacecraft to send humans back to the moon as early as 2015 and use it as a launching point for manned missions to Mars and beyond.
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