Stock Photo - In the International Space Station's Rassvet Mini-Research Module 1 (MRM-1), Russian cosmonaut Maxim Suraev, Expedition 40 flight engineer, performs a session of the Calcium experiment, which examines the causes of the loss of bone density that occurs in a weightless environment. For this study, Russian researchers are looking at the solubility of calcium phosphates and human bone samples in water in space.

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