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Forscher wollen Dunkle Materie beobachtet haben

Das Higgs-Boson ist der Schlüssel zum Verständnis der uns bekannten Materie – doch die macht nur rund fünf Prozent des Universums aus. Jetzt behaupten Forscher, einen Blick auf den Rest geworfen zu haben: Sie melden die erste direkte Beobachtung Dunkler Materie.

 

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Juli 4, 2012 Posted by | Presse | | Hinterlasse einen Kommentar

Did Dark Matter Destroy Universe 1.0?

No galaxies have been seen before at such early epochs as that seen in this deepest images of the universe ever taken in near-infrared light by NASA’s Hubble Space Telescope (see video below). The faintest and reddest objects in the image are galaxies that correspond to „look-back times“ of approximately 12.9 billion years to 13.1 billion years ago.

A longstanding enigma is that it still appears that these early galaxies did not emit enough radiation to „reionise“ the early Universe by stripping electrons from the neutral hydrogen that cooled after the Big Bang. This „reionisation“ event occurred between about 400 million and 900 million years after the Big Bang, but astronomers still don’t know which light sources caused it to happen. These newly discovered galaxies date from this important epoch in the evolution of the Universe.

It took about the first billion years to completely ionize the Universe; before that, the Universe was opaque to light, with neutral atoms acting like dust. As the Universe reionizes, it becomes easier to see the light from whatever objects are behind it. The youngest object ever discovered in the universe, Gamma Ray Burst GRB 090423, born when the Universe was under 0.7 billion years old. This thing is so far away that no visible light actually got out; we can only see the X-rays from it

These early Hubble galaxies are much smaller than the Milky Way and other spiral galaxies and have populations of stars that are intrinsically very blue. This may indicate the galaxies are so primordial that they are deficient in heavier elements, and as a result, are quite free of the dust that reddens light through scattering.

Ross McLure of the Institute for Astronomy at Edinburgh University and his team detected 29 galaxy candidates, of which twelve lie beyond redshift 6.3 and four lie beyond redshift 7 (where the redshifts correspond to 890 million years and 780 million years after the Big Bang respectively). He notes that „the unique infrared sensitivity of Wide Field Camera 3 means that these are the best images yet for providing detailed information about the first galaxies as they formed in the early Universe“.

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Februar 8, 2010 Posted by | Presse | , | Hinterlasse einen Kommentar

Dunkle Materie/ Dunkle Energie

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Dezember 18, 2009 Posted by | Wissenschaft | , | Hinterlasse einen Kommentar