Cosmic background radiation 13.8 billion years - Search
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  1. Age of the universe - Wikipedia

    • As of 2024, using the latest models for stellar evolution, the estimated age of the oldest known star is 13.8 ± 4 billion years. [ 9 ] The discovery of cosmic microwave background radiation announced in 1965 [ 10 ] finally brought an effective end to the remaining scientific uncertainty over the expanding universe. See more

    Overview

    In physical cosmology, the age of the universe is the time elapsed since the Big Bang: 13.8 billion years. Astronomers have two different approaches to determine the age of the universe. One is based on a particle phy… See more

    History

    In the 18th century, the concept that the age of Earth was millions, if not billions, of years began to appear. Nonetheless, most scientists throughout the 19th century and into the first decades of the 20th century presumed t… See more

     
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