ESA’s Mars Express is due to arrive at Mars in December 2003, and its Beagle 2 lander will be making a touchdown in the middle of the Martian winter. Will it see a ‘white Christmas’ on the Red Planet? Also, if humans one day go to Mars, would they need to take a sunscreen?
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http://www.esa.int/export/esaCP/SEM68PYO4HD_index_0.html