The universe is estimated to be around 13.8 billion years old.
This description provides an overview of the age of the universe. It explains that the universe is estimated to be around 13.8 billion years old, a figure that has been determined by scientists through various methods of observation and calculation. This age is remarkable, as it indicates that the universe has been
In Big Bang models of physical cosmology, the age of the universe is the cosmological time back to the point when the scale factor of the universe extrapolates to zero. The age is about 13.8 billion years, with the latest models estimating it more precisely as 13.787 billion years. Astronomers have two different approaches to determine the age of the universe. One is based on a particle physics model of the early universe called Lambda-CDM, matched to measurements of features from very early in the history of the universe, like the cosmic microwave background. The other is based on the distance and relative velocity of a series or "ladder" of different kinds of stars, making it depend on local measurements late in the history of the universe. These two methods give slightly different values for the Hubble constant, which is then used in a formula to calculate the age. The range of the estimate is also within the range of the estimate for the oldest observed star in the universe.