article_snippet.sent: The study by scientists at Nasa's Goddard Space Flight Center in Greenbelt, Maryland, is the first to determine just how much Mars Mars had in Mars past.
article_snippet.sent: Curiosity has been studying rocky areas since landing on the Martian surface in 2012.
article_snippet.sent: We investigated Pahrump Hills the way a field geologist would, looking over the whole outcrop first to choose the best samples to collect, and Pahrump Hills paid off,' said David Blake of Nasa's Ames Research Center.
article_snippet.sent: Analysis is still in its early stages, but the three drilled samples from Pahrump Hills have clear differences in mineral ingredients.
article_snippet.sent: Curiosity is now exploring different layers of Mount Sharp in the hope of finding more clues to the planet's history.