NASA's Mars rover Opportunity has reached the main destination of its current two-year extended mission -- an ancient fluid-carved valley on the inner slope of a crater rim.
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NASA's Mars rover Opportunity has reached the main destination of its current two-year extended mission -- an ancient fluid-carved valley on the inner slope of a crater rim.
Hubble Home About Hubble The History of Hubble Hubble Timeline Why Have a Telescope in Space? Hubble by the Numbers At the Mu...
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