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With the arrival of the Perseverance rover on Mars, scientists kick off a series of missions to bring back samples from the Red Planet in a quest to answer the age-old question if life exists beyond Earth. The rover follows NASA's ongoing Mars Science Laboratory Curiosity mission to look for habitable environments and cache samples for return to Earth. NASA is partnering with the European Space Agency for the sample return project. Meanwhile, the international fleet of spacecraft operating around Mars now includes the United Arab Emirates' Hope and China's Tianwen-1 orbiters, which arrived on Feb. 9 and 10, respectively.