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Re: Space.com: Huge hole found in the universe

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  • mahtezcatpoc
    ... http://en.wikipedia.org/wiki/Eridanus_Supervoid Centered on RA 3h15m05s declination −19d35m02s zodiacal coordinates: 9 Taurus 53. Mark A. Holmes
    Message 1 of 2 , Feb 15, 2008
      --- In thefixedstars@yahoogroups.com, "mahtezcatpoc"
      <mahtezcatpoc@...> wrote:
      > http://www.space.com/scienceastronomy/070823_huge_hole.html


      Centered on

      RA 3h15m05s
      declination −19d35m02s

      zodiacal coordinates: 9 Taurus 53.

      Mark A. Holmes

      > Begin story.--
      > Huge Hole Found in the Universe
      > By Robert Roy Britt
      > Senior Science Writer
      > posted: 23 August 2007
      > 05:21 pm ET
      > The universe has a huge hole in it that dwarfs anything else of its
      > kind. The discovery caught astronomers by surprise.
      > The hole is nearly a billion light-years across. It is not a black
      > hole, which is a small sphere of densely packed matter. Rather, this
      > one is mostly devoid of stars, gas and other normal matter, and it's
      > also strangely empty of the mysterious "dark matter" that permeates
      > the cosmos. Other space voids have been found before, but nothing on
      > this scale.
      > Astronomers don't know why the hole is there.
      > "Not only has no one ever found a void this big, but we never even
      > expected to find one this size," said researcher Lawrence Rudnick of
      > the University of Minnesota.
      > Rudnick's colleague Liliya R. Williams also had not anticipated this
      > finding.
      > "What we've found is not normal, based on either observational studies
      > or on computer simulations of the large-scale evolution of the
      > universe," said Williams, also of the University of Minnesota.
      > The finding will be detailed in the Astrophysical Journal.
      > The universe is populated with visible stars, gas and dust, but most
      > of the matter in the universe is invisible. Scientists know something
      > is there, because they can measure the gravitational effects of the
      > so-called dark matter. Voids exist, but they are typically relatively
      > small.
      > The gargantuan hole was found by examining observations made using the
      > Very Large Array (VLA) radio telescope, funded by the National Science
      > Foundation.
      > There is a "remarkable drop in the number of galaxies" in a region of
      > sky in the constellation Eridanus, Rudnick said.
      > The region had been previously been dubbed the "WMAP Cold Spot,"
      > because it stood out in a map of the Cosmic Microwave Background (CMB)
      > radiation made by NASA's Wilkinson Microwave Anisotopy Probe (WMAP)
      > satellite. The CMB is an imprint of radiation left from the Big Bang,
      > the theoretical beginning of the universe.
      > "Although our surprising results need independent confirmation, the
      > slightly colder temperature of the CMB in this region appears to be
      > caused by a huge hole devoid of nearly all matter roughly 6 to 10
      > billion light-years from Earth," Rudnick said.
      > Photons of the CMB gain a small amount of energy when they pass
      > through normal regions of space with matter, the researchers
      > explained. But when the CMB passes through a void, the photons lose
      > energy, making the CMB from that part of the sky appear cooler.
      > --End story.
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