John Callas

Associated PressThis July 26, 2004 photo made available by NASA shows the shadow of the Mars Exploration Rover Opportunity as it traveled farther into Endurance Crater in the Meridiani Planum region of Mars. (NASA/JPL-Caltech via AP)

After wildly successful Mars Rover Opportunity’s end, what’s next?

The Mars Exploration Rover Opportunity was only supposed to last 90 days but ended up clocking 5,000.

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