This ultra large structure is on the direction of constellation Pisces and 400 light years away from Earth.This is a very high concentration of galaxies in the universe and it is very rare. Few such structures have been observed till now and this is definitely a first from India as all authors are Indians Shishir Sankhyayan from IISER. Since the galaxy that has been discovered is far away from earth, the light has taken that much more time to reach Earth. This means what the scientists have observed is actually the past.This helps us understand how the universe must have been many many years ago. Dark energy, as we all know, is behind the expansion of the universe but nobody has ever actually detected it. But everybody is studying this and the discovery of Saraswati will help us understand the dark energy and what part it plays in the expansion and other evolution of the universe.We were very surprised to spot this giant wall-like supercluster of galaxies, visible in a large spectroscopic survey of distant galaxies, known as the “Sloan Digital Sky Survey”.
This supercluster is clearly embedded in a large network of cosmic filaments traced by clusters and large voids. Our work will help to shed light on the perplexing question; how such extreme large scale, prominent matter-density enhancements had formed billions of years in the past when the mysterious Dark Energy had just started to dominate structure formatio. Earth, which belongs to Milky Way galaxy, is actually also a part of a supercluster called the Laniaka supercluster.A team of Indian scientists has reported the discovery of a previously unknown ‘supercluster’ of galaxies, some four billion light years away from Earth, and named it Saraswati. Superclusters, a group of clusters of galaxies, are the largest structures of stars, planets and other heavenly bodies in the universe, and very few of them are known. There are basically only four or five known superclusters of this size in the entire universe Besides Sankhyayan. Galaxies are themselves made of billions of stars and planets, and a cluster typically contains several hundreds of these galaxies. Superclusters are relatively recent finds, having been identified for the first time only in the 1980s. The Milky Way galaxy, of which Earth is a very small member, is part of the Laniakea supercluster, that was identified only in 2014, Sankhyayan said the Saraswati supercluster was estimated to have a mass of 2 x 1016 (twenty thousand trillion) suns, and could contain thousands of suns, besides having billions of stars, planets, other bodies, gases and dark matter. Saraswati is estimated to be stretched over 650 million light years in distance.