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Mars Base

Astronomers discover the largest structure in the universe - 0 views

phys.org/...ronomers-largest-universe.html

scibyte77 LQG

shared by Mars Base on 13 Jan 13 - No Cached
  • The large quasar group (LQG) is so large that it would take a vehicle travelling 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.
  • 'brief' in astrophysics terms but actually last 10-100 million years.
  • ...11 more annotations...
  • 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.
  • the LQG which is so significant in size it 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
  • he Principle is assumed but has never been demonstrated observationally 'beyond reasonable doubt'.
  • the Milky Way, is separated from its nearest neighbour, the Andromeda Galaxy, by about 0.75 Megaparsecs (Mpc) or 2.5 million light-years.
  • Whole clusters of galaxies can be 2-3 Mpc
  • LQGs can be 200 Mpc or more across.
  • Based on the Cosmological Principle and the modern theory of cosmology, calculations suggest that astrophysicists should not be able to find a structure larger than 370 Mpc.
  • newly discovered LQG however has a typical dimension of 500 Mpc.
  • it is elongated, its longest dimension is 1200 Mpc (or 4 billion light years)
  • some 1600 times larger than the distance from the Milky Way to Andromed
Mars Base

Biggest Thing in Universe Found-Defies Scientific Theory - 0 views

news.nationalgeographic.com/...iverse-science-space-evolution

scibyte77 LQG

shared by Mars Base on 13 Jan 13 - No Cached
  • Using data from the Sloan Digital Sky Survey, an international team of researchers has discovered a record-breaking cluster of quasars—young active galaxies
  • the Milky Way, is just a hundred thousand light-years across
  • the local supercluster of galaxies in which it's located, the Virgo Cluster, is only a hundred million light-years wide
  • ...1 more annotation...
  • "It could mean that our mathematical description of the universe has been oversimplified-and that would represent a serious difficulty and a serious increase in complexity,"
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