Astronomers have discovered a galactic "supercluster" known as Vela Supercluster, which has been almost completely hidden from Earth since its discovery 10 years ago. The discovery was made due to its location within the Milky Way's "Zone of Avoidance," which is so full of stars and dust that obscures anything behind it. The supercluster is a collection of at least 20 galaxy clusters, each containing hundreds or thousands of galaxies, all gravitationally bound into a single entity. It was initially named "Terra incognita" as a "unknown land" in Latin, and its location had prevented researchers from accurately mapping its true size. The study, which combined 65,000 existing galaxy distance measurements with around 8,000 new redshift observations of other galaxies, revealed that the structure is around 300 million light-years across and contains an enormous amount of matter equivalent to about 30 quadrillion suns. It now ranks as more massive than Laniākea, the superclusters that contain Earth and the rest of our galaxy, and is "a close second" to the Shapley Superclusters. The researchers believe it may be possible to create more accurate maps with more powerful radio telescopes in the future.