On Sunday, NewsHour Weekend profiles South African photographer and activist Zanele Muholi, whose mission is to create visibility for black lesbian and transgender communities in her home country through her work. Her latest exhibit is currently on display at the Brooklyn Museum through November 2015. Also on Sunday, NewsHour Weekend explores a NASA-funded study focused on the psychological impact of a potential mission to Mars. For the past eight months, six people have been living in a self-sustaining 1, 000 square-foot dome on the Mauna Loa volcano in Hawaii, cut off from the outside world. It is the longest space-travel simulation to take place in the United States.