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Starting in 2004, the evidence of the presence of water on Mars has been mounting. The Opportunity rover discovered geological markers - stratification and cross-bedding - near its landing site which pointed to significant flows of water at some time in Mars' history. Around the same time the Mars Express orbiter detected the spectral evidence of water present in the polar regions. In 2005, Mars Express confirmed this by locating an area of solid water ice near the north pole. The Phoenix lander confirmed the existence of water ice in Mars. read more See all featured articles | Nominate!