Monday , March 20 2023

How old is the universe?


The remarks of an unprecedented resolution now provide more precision on the age of the universe. According to astronomers, it is 13.77 billion years old, up to 40 million years old.

determinedthe age of the universe, it’s not simple. astronomers I’ve been working there for a long time. Today, the new comments seem to want to make everyone agree. Of Cornell University researchers (United States) yesUniverse 13.77 billion years, to the nearest 40 million years.

To arrive at this estimate, astronomers relied on data from diffuse cosmological background collected by telescope cosmological analysis of Atacama (ACT, Chile) between 2013 and 2016. And joins the values ​​offered by standard model of cosmology and measurements made on the same background diffused by the space observer Planck of the European Space Agency (THAT) between 2009 and 2013.

Towards a revolution for cosmology?

Remember that in 2019, a research team, based on measurements of movements of galaxies, had estimated that the universe must be hundreds of millions of years younger. They had argued that constant hubble – which measures speed to which our Universe expands – was equal to about 74 kilometers per second per megaparsec. Much more than the 67.4 or 67.6 km / s / Mpc granted by Planck or Cornell University researchers.

This difference in measurements raises the question of the accuracy of the various measurements. But the fact that for the first time independent measurements performed on diffuse cosmological background, give the same result, while more local measurements always lead to a younger age, it could be a sign that we could be atdaybreak of a discovery that will change us understanding how the universe works.

Age of the Universe: 13-14 billion years

Hubble’s new observations confirm a 13-14 billion-year-old universe. Auscultândglobular cluster M4, the 7000 light years of soleil into the the constellation Scorpio, astronomers have detected stars the oldest in the universe, white dwarfs of magnitude 30 whose temperature and age were determined. These stars are 12-13 billion years old. Star life cycle models claim that they are early stars formed 1 billion years later The big bang. Suddenly, the universe would be 13 to 14 billion years old.

Article by Remy Decourt published on 28.04.2002


To our knowledge, since the Big Bang, the Universe has not stopped growing, but at a non-constant rate of expansion. Today the universe continues to advance, but a mysterious one energy darkness (repulsive force) tends to accelerate this expansion.

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