Several months ago scientists identified the Milky Way's position in an immense cosmic structure called Laniakea. Stretching 500 million light-years across, our own galaxy appears as a small spot within the supercluster. Now, a team of researchers have begun mapping another even bigger concentration of galaxies, known as the Shapley Supercluster. According to Dr. Brent Tully of the University of Hawaii, the project will take decades to complete. Check out video here.