Universe's matter content, illustration

Numéro d’image : 12553531
Universe's matter content, illustration
Universe's matter content. Illustration showing the proportions of the Universe's matter content. Matter makes up about 30% of the Universe, the rest is dark energy. The matter can be dark (29%) or visible (1%, top layer). The dark matter can be further divided into non baryonic (25%, bottom layer) and baryonic (4%, middle layer) dark matter. The visible matter (the Universe's luminous stars) is not enough to explain the universe's observed expansion rate. This missing mass can be accounted for by MACHOs (massive astrophysical compact halo objects) such as brown dwarf stars, or elementary particles like WIMPS (weakly-interacting massive particles). MACHOs are baryonic matter (containing protons and neutrons) and WIMPS are non-baryonic. Dark energy is a relatively unknown quantity that is thought to be driving the Universe's expansion.
Licence : Droits gérés
Crédit: Science Photo Library / TIM BROWN
Taille de l’image : 4252 px × 4275 px
Model Release : Non requis
Property Release : Non requis
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