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The Question

(Submitted January 05, 2009)

Does a ratio of baryonic vs. non-baryonic matter have any part in the balance of the universe?

The Answer

According to the recent WMAP satellite results non-baryonic matter occupies as much as ~74% (this is called "dark energy") while visible baryonic matter occupies only ~4%. The rest of the 22% is called "dark matter", but the vast majority of the the dark matter in the universe is thought to be non-baryonic.

Keigo Fukumura
for "Ask an Astrophysicist"

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