... Visible vistas include a vast and colorful Earth, a deep dark sky, and an occasional spaceship sent to visit the station. ... The M81 Galaxy Group Through the Integrated Flux Nebula . ... Most of the time, the apparent motion of Mars in Earth's sky is in one direction, slow but steady in front of the far distant stars. About every two years, however, the Earth passes Mars as they orbit around the Sun. ... Quite possibly, in hundreds of millions of years, only one galaxy will remain. ...