Cosmic bigness.Astronomers have found the largest structures ever discovered in the universe--filaments of galaxies 200 million light-years in length that date from just 2 billion years after the Big Bang big bang Model of the origin of the universe, which holds that it emerged from a state of extremely high temperature and density in an explosive expansion 10 billion–15 billion years ago. . The filaments contain 30 giant pockets of gas, each of which maybe as much as 10 times the mass of the Milky Way Milky Way, the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon to horizon; if not blocked by the horizon, it would be seen as a circle around the entire sky. . Such large structures were rare in the early universe and are probably the precursors of the type of galaxy clusters This page lists some of the more interesting galaxy clusters and groups. Defining the limits of galaxy clusters is imprecise as many clusters are still forming. In particular, clusters close to the Milky Way tend to be classified as galaxy clusters even when they are much smaller seen today, says Ryosuke Yamauchi of Tohoku University This article is Tohoku University in Japan. The same name university in China, 東北大学, is Northeastern University (Shenyang, China). Tohoku University ( in Sendai, Japan. Yamauchi is part of a team that used the Subaru and Keck II telescopes atop Hawaii's Manna Kea to study a patch of sky known to contain a high density of galaxies. Subaru images, combined with velocity measurements from Keck, revealed much fainter objects than had previously been discovered in the region. The pockets of gas, first discovered 6 years ago, are known as Lyman-alpha blobs. The Subaru observatory announced the findings on July 26. Theory suggests that the seeds of these large structures formed during the birth of the universe, comments John Peacock of the Royal Observatory Royal Observatory may refer to:
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