The Largest Structure in Universe Discovered --Quasar Group 4 Billion Light-Years Wide Challenges Current Cosmology
The largest known structure in the universe has been discovered by an international team of astronomers. The large quasar group (LQG -a portion shown above)) is so large that it would take a vehicle traveling at the speed of light some 4 billion years to cross it. Quasars are the nuclei of galaxies from the early days of the universe that undergo brief periods of extremely high brightness that make them visible across huge distances. These periods are 'brief' in astrophysics terms but actually last 10-100 million years. Since 1982 it has been known that quasars tend to group together in clumps or 'structures' of surprisingly large sizes, forming large quasar groups or LQGs.read more: http://www.dailygalaxy.com/my_weblog/2013/01/the-largest-structure-universe-discovered-quasar-group-4-billion-light-years-wide-challenges-current.html
The LQG also challenges the Cosmological Principle, the assumption that the universe, when viewed at a sufficiently large scale, looks the same no matter where you are observing it from. The modern theory of cosmology is based on the work of Albert Einstein, and depends on the assumption of the Cosmological Principle. The Principle is assumed but has never been demonstrated observationally 'beyond reasonable doubt'.
To give some sense of scale, our galaxy, the Milky Way, is separated from its nearest neighbor, the Andromeda Galaxy, by about 0.75 Megaparsecs (Mpc) or 2.5 million light-years.
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