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What's the universe made of?

  1. Nov 5, 2013 #1

    wolram

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    So far i know that------26.8% is dark mater, 68.3% is dark energy and 4.9% is normal matter.

    what is meant by [normal matter] and what is the proportion of luminous matter.
     
  2. jcsd
  3. Nov 5, 2013 #2

    mfb

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    The cosmic energy inventory has a detailed list of those contributions. It was written before the Planck collaboration published results, but that should just give small changes.
     
  4. Nov 5, 2013 #3

    bapowell

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    From wikipedia: "Ordinary matter is divided into luminous matter (the stars and luminous gases and 0.005% radiation) and nonluminous matter (intergalactic gas and about 0.1% neutrinos and 0.04% supermassive black holes)." Luminous matter makes up about 10% of ordinary matter. Ref: http://en.wikipedia.org/wiki/Matter
     
  5. Nov 7, 2013 #4

    wolram

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    Is this correct, only 0.045% of the universe is baryons?
     
    Last edited: Nov 7, 2013
  6. Nov 7, 2013 #5

    phyzguy

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    Yes, I believe that's correct. I think Planck gives 4.9%, but that's just a quibble.
     
  7. Nov 7, 2013 #6

    bapowell

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    About 4.5% is atoms (baryons)...are you off by a factor of 100 accidentally?
     
  8. Nov 7, 2013 #7

    wolram

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    My mistake, i have looked again and it is in deed 4.5%.

    Thanks.
     
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