The continent of Australia is shown in this handout photo taken from the International Space Station by astronaut Scott Kelly and provided by Nasa yesterday. Kelly and Russian Federal Space Agency cosmonaut Mikhail Kornienko began their one-year mission aboard the space station on March 27, 2015. By doubling the length of this mission, researchers hope to better understand how the human body reacts and adapts to long-duration spaceflight, according to Nasa.