Page "Mars Exploration Rover" Paragraph 27
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Spirit celebrated its one Martian year anniversary ( 669 sols or 687 Earth days ) on November 20, 2005.
Opportunity celebrated its anniversary on December 12, 2005.
At the beginning of the mission, it was expected that the rovers would not survive much longer than 90 Martian days.
The Columbia Hills were " just a dream ", according to rover driver Chris Leger.
Spirit explored the semicircular rock formation known as Home Plate.
It is a layered rock outcrop that puzzles and excites scientists.
It is thought that its rocks are explosive volcanic deposits, though other possibilities exist, including impact deposits or sediment borne by wind or water.
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