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The Planets: Mars

OPPORTUNITY EXPLORES FOR 14 YEARS
DISCOVERS EVIDENCE OF ANCIENT FLOWING WATER
NARRATOR: Over 50 years of Mars exploration has revealed intriguing clues, suggesting Mars has a surprisingly watery past.
ASHWIN VASAVADA: There’s a lot of evidence for ancient flowing water on Mars. For one thing, there’s a lot of rivers that once coursed across the surface that are now dry, today. There’s also evidence for floods that catastrophically scoured the surface.
JOHN GROTZINGER: It’s undeniable that the early history of Mars was much wetter than it is today.
STEVE SQUYRES: The surface of Mars is littered with an uncountable number of little round things. These “blueberries,” as we nicknamed them, are what geologists call “concretions.” ....

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