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Contents of the Universe

Contents of the Universe - • the seeds from which giant...

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Contents of the Universe Cosmic background radiation photons are now observable at Temp of 3K o have been cooled and stretched o coming from a very distant part of the universe – looking about 14 billion years back Look at universe when it was 380,000 years old – can’t look beyond that because of an opaque “wall” that is formed from moving photons radiation cannot penetrate it problems with CBR o there would have been no reason for certain galaxies to form and then into clusters in certain places if universe was perfectly uniform clumps should be visible as temperature variations in the CBR o found tiny variations in temperature Smallest ones are about 10 degrees across
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Unformatted text preview: • the seeds from which giant superclusters of galaxies formed largest variations are the biggest structures in the universe the imprints of tiny ripples in the fabric of space-time put there during the Big Bang • grew into galaxies, clusters, superclusters • The Universe is spatially flat, on the largest scales that we can see o if the total matter in the universe is equal to 1 and the OmegaM is only . 27, than there must be .73 of something else that makes up the rest of the universe has to be gravitationally non-attractive • Age of the Universe is about 13.7 billion years o First massive stars started forming around 300 million years after the Big Bang •...
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