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Interactions.org - Particle Physics News and Resources

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  • Image# FN0444
  • FN
  • 08/18/2014

Spiral galaxy NGC 0895 is located in the constellation Cetus, about 110 million light-years from Earth. This image was taken with the Dark Energy Camera, the primary research tool of the Dark Energy Survey, which just began its second year of cataloging deep space. (Photo: Dark Energy Survey)

  • Image# FN0443
  • FN
  • 08/18/2014

This image of the NGC 1398 galaxy was taken with the Dark Energy Camera. This galaxy lives in the Fornax cluster, roughly 65 million light-years from Earth. It is 135,000 light-years in diameter, just slightly larger than our own Milky Way galaxy, and contains more than 100 billion stars. (Credit: Dark Energy Survey)

  • Image# FN0442
  • FN
  • 08/18/2014

Stars over the Cerro Tololo Inter-American Observatory, which houses the Dark Energy Camera in Chile. (Credit: Reidar Hahn/Fermilab)

  • Image# FN0445
  • FN
  • 08/18/2014

The large spiral galaxy in the center of this image is roughly 385 million light-years from Earth. This image was captured with the Dark Energy Camera as part of the first year of the Dark Energy Survey. The camera can see 8 billion light-years into deep space. (Photo: Dark Energy Survey)

  • Image# SL0111
  • SL
  • 03/17/2014

The bottom part of this illustration shows the scale of the universe versus time. Specific events are shown such as the formation of neutral Hydrogen at 380 000 years after the big bang. Prior to this time, the constant interaction between matter (electrons) and light (photons) made the universe opaque. After this time, the photons we now call the CMB started streaming freely. The fluctuations (differences from place to place) in the matter distribution left their imprint on the CMB photons. The density waves appear as temperature and "E-mode" polarization. The gravitational waves leave a characteristic signature in the CMB polarization: the "B-modes". Both density and gravitational waves come from quantum fluctuations which have been magnified by inflation to be present at the time when the CMB photons were emitted. (Courtesy: SLAC)

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