Phil Christensen, Mars Exploration Rover (MER) lead scientist for Mini-TES, describes the findings of grey hematite on Mars by the rover, "Opportunity", during a press conference at the Jet Propulsion Laboratory (JPL) in Pasadena, California on Saturday, 31 January 2004. Grey hematite is a mineral that usually indicates a presence of past water. Chris Salvo, MER flight director, is show at left. Photo by Francis Specker

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Photo credit: © Francis Specker / Alamy / Afripics
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Keywords: 2004, america, chris, christensen, jet, jpl, lab, mars, mini-tes, nasa, pasadena, phil, planet, propulsion, rover, salvo, science, space, states, united, usa