While the moon is the main goal of NASA's Artemis program, the agency's larger goal is to send crewed missions to Mars. But long-term space travel and habitation won't be easy. Such missions will present both physical and mental challenges as astronauts work to not only survive, but perform important scientific research in uniquely difficult environments. In the upcoming NASA-Russia experiment, which builds on a previous four-month-long study from 2019, a crew will live in isolation in a closed facility at Russia's Institute for Biomedical Problems, which is in Moscow, NASA officials said in a statement. This habitat facility was...