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S T E M I N C U R R E N T E V E N T S

Computers combined several images fromMRO to illustrate what this slope on the inside of a crater would look like over time, showing flows of material down its sides.

we have convincing science that validates what we’ve long sus- pected,” said John Grunsfeld, a U.S. astronaut and NASA official.

Earthlings have studied Mars since ancient times, and for nearly half a century our machines have traveled to the