The Age of The Universe

The Age of The Universe

The universe is about 13.8 billion years old, according to researches by an international team of astrophysicists.

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The universe is (nearly) 14 billion years old, astronomers confirm. With looming discrepancies about the true age of the universe, scientists have taken a fresh look at the observable (expanding) universe and have estimated that it is 13.77 billion years old (plus or minus 40 million years).

In 2019, scientists studying the movement of galaxies concluded that the universe is hundreds of millions of years younger than previously estimated by the Planck Collaboration, a group of scientists who have worked with the European Space Agency's Planck mission. Using data from the Planck space observatory, they found the universe to be approximately 13.8 billion years old.

To settle the score, an international team of astronomers led by Cornell University used data from the National Science Foundation's Atacama Cosmology Telescope (ACT) in Chile and "cosmic geometry" to end the debate, Cornell officials said in a statement. Their estimate of (about) 13.77 billion years roughly matches the estimate from the Planck Collaboration.

By determining the age of the universe, the researchers also were able to estimate how fast the universe is expanding — this figure is known as the Hubble constant. With ACT, they calculated a Hubble constant of 42 miles per second per megaparsec, or 67.6 kilometers per second per megaparsec. In other (simpler) words, they found that an object 1 megaparsec (or about 3.26 million light-years) away from Earth would be moving away from Earth at 42 miles per second (67.6 km/s).

How Many Galaxies Are There?

The cosmos contains approximately 100 - 200 billion galaxies.

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Dark Energy

Humans can only see about 4% of the matter in the Universe.

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Mercury and Venus

The only two planets in our solar system that do not have moons are Mercury and Venus.

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Our Sun's Orbit

The sun orbits around the Milky Way at a speed of about 220 km (140 miles) per second.

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