With Opportunity Gone, Mars Researchers Look Ahead to 2020 Launches
Next year an international armada will head for the Red Planet.
A mosaic of Mars images captured by the Viking Orbiter 1, which operated around the planet from 1976 to 1980. Valles Marineris, the largest canyon in the solar system, cuts across middle of the planet, stretching over 3,000 km long and up to 8 km deep.
NASA/USGS
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