Matter-dominated era

Full-sky image derived from nine years' WMAP data

The matter-dominated era was the epoch in the evolution of the Universe that began when the radiation-dominated era ended, when the Universe was about 47,000 years old. Although it was often said that we still live in the matter-dominated era, it is more correct to say that when the Universe was about 9.8 billion years old, this era ended and was replaced by the dark-energy-dominated era. This change of the perspective occurred when the cosmological constant or dark energy was first observed in the late 1990s.

单词	Matter era
释义	Matter era 英语百科 Matter-dominated era The matter-dominated era was the epoch in the evolution of the Universe that began when the radiation-dominated era ended, when the Universe was about 47,000 years old. Although it was often said that we still live in the matter-dominated era, it is more correct to say that when the Universe was about 9.8 billion years old, this era ended and was replaced by the dark-energy-dominated era. This change of the perspective occurred when the cosmological constant or dark energy was first observed in the late 1990s.
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Matter era

Matter-dominated era