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Will I have to work on Saturdays? flames buy retin a tretinoin gel some "If one day humans send a robotic lander to the surface of Europa, we need to know what to look for and what tools it should carry," said the study's lead author, Robert Pappalardo, from NASA's Jet Propulsion Laboratory in California. "Europa is the most likely place in our solar system beyond Earth to have life today, and a landed mission would be the best way to search for signs of life."