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Astronomers estimate the age of the universe

by Zhiwei Lu about a month ago in Science
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Universe 13.77 billion years old?

Astronomers' latest observations and calculations show that the universe is 13.77 billion years old, give or take 40 million years.

According to scientific American magazine web site reported on January 5, the Cornell researchers used the national science foundation, the atacama cosmology telescope (ACT) to collect the data of estimate, the results and the universe estimate provided by matching the standard model, and the European space agency's Planck "probe for measuring results of the same light.

According to Sciencedaily on January 4, at an observatory high in Chile's Atacama desert, astronomers have reanalyzed the oldest light in the universe. Coupled with some knowledge of cosmic geometry, their observations suggest that the universe is 13.77 billion years old -- give or take 40 million years.

There are now two published papers on the findings, one co-written by a Cornell researcher. This adds a new twist to the ongoing debate in astrophysics.

The new estimate, which uses data collected by the National Science Foundation's Atacama Cosmology Telescope (ACT), matches the Standard Model of the Universe and measurements of the same light from the European Space Agency's Planck probe, the report said. The Planck probe measured the remnants of the Big Bang between 2009 and 2013.

The research paper was published in the Journal of Cosmology and Astroparticle Physics.

The lead author of the paper is Steve Choi. He is a postdoctoral fellow at the Cornell Center for Astrophysics and Planetary Science, part of Cornell University's College of Arts and Sciences.

In 2019, a research team measuring the motions of galaxies reportedly calculated that the universe is much younger than the team behind the Planck probe had assumed. The discrepancy suggests that a new model of the universe may be needed, and raises concerns that one set of measurements may be wrong.

Simone Ayola, a researcher at the Fratiren Institute's Center for Computational Astrophysics, said: "Now, we have an answer that agrees with the Planck probe and ACT. This proves that these complex measurements are reliable

Using telescopes to look at the spectrum of uranium from the oldest stars, scientists have estimated the age of the universe at 12.5 billion years. Scientists have different estimates of the age of the Universe. According to different cosmological models, scientists estimate the age of the Universe to be between 10 billion and 16 billion. 2001 south European observatory (European Southern Observatory) scientists used the telescope to observe a CS31082-001 planet, Measuring the spectrum of the radioactive isotope, Uranium-238, on the planet, gives us an age of 12.5 billion years, which is off by about three billion years, meaning that The universe is at least 12.5 billion years old, and this is the first time scientists have measured the amount of uranium outside the SolarSystem.

The prevailing cosmological model is the λCDM model, where we say the universe is about 15 billion years old (it's actually 13.787 billion years old), based on observations and the λCDM model, rather than extrapolating from observable distances. Hubble once discovered what is known as Hubble's Law: The rate at which a galaxy is retreating is proportional to its distance from us, and the scaling factor is Hubble's constant. If the Hubble constant does not change over time, it is easy to know that the age of the universe should be exactly the inverse of the Hubble constant. So all we have to do is measure the Hubble constant and invert it to get a rough estimate of the age of the universe. (Of course, the Hubble Constant actually changes over time, so the reciprocal method is only a rough estimate and requires the composition of the universe.) The subject may have misunderstood the word "observable". "Observable" feels like there's only so much we can detect because of our technology, and as technology gets better, the observable universe gets bigger and bigger. But this idea is a misunderstanding! What the observable universe really means is that the observable universe is the range of causally related objects whose radius is equal to the distance that a photon of light has traveled from the moment the universe was born to the present. That is, the observable universe is an entirely theoretical concept, unrelated to human technology, whose size can be calculated in the λ CDM model.


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Zhiwei Lu

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Comments (4)

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  • Toby Hewardabout a month ago

    Great info, keep up the great work.

  • waqas Ahmadabout a month ago

    best info thanks

  • dawntsai8about a month ago

    There are still many unsolved mysteries in the universe. Use Uscamel telescopes for the beginners at to observe what's happened or happening in the outer space.

  • Joseph Juneabout a month ago

    Great story. Thank you for sharing.

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