Meridiani planum was chosen because it contains large amounts of minerals that could form water.
The constant research on Mars, and the possibility of this planet harboring living beings, needed to continue with more specific views and through devices that would support the atmosphere of Mars for a long time.
In this case, the Opportunity Mission was established to launch space probes on Mars in the year 2003, so that probes could roam the surface of the planet in search of clean water.
As previous research showed that Meridiani planum had a large number of minerals that could form water, it was the chosen place for the probes to land.
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