Astronomers have determined the exact speed of the Universe's expansion

Galaxy, visible at a distance of 10 MPC, fleeing with a speed of 735 kilometers per second.

Astronomers were able to produce the most accurate measurement of the speed of the Universe's expansion with the Gaia and Hubble telescopes. According to the new data, the Hubble constant is 73.5 kilometers per second per megaparsec, that is, the difference between the already known values ​​was even greater than

. 100-year-old astrophysicist Edwin Hubble was observing distant galaxies and determined that they were not static, but that they were gradually diverging, and that the specific elimination rate of ## EQU1 ## 39, a galaxy was directly proportional to its distance. Today, this law is called the law of Hubble's constant, which is included in it, is called the Hubble constant.

A team of astronomers under the direction of Nobel Laureate Adam Riess, who received the award for the discovery of accelerated expansion of the Universe through observations "warmed up" this contradiction, receiving data using the Gaia and Hubble telescopes.

Astronomers calculated the distance to neighboring galaxies with Cepheids – a class of pulsating supernova (replacement), stars (giant and supergiants). This class of stars has a well established relationship between the period of brightness changes and the magnitude of the star – the brighter the star, the more slowly it is pulsed. If we know two stars pulsating with the same period, and the distance to one of them, the distance to the other can be determined by a simple formula.

The researchers compared the absolute magnitudes of the Cepheids 50, calculated with the Hubble telescope, to an apparent magnitude, and determined the distance that separates them. Scientists then refined the data using the Gaia telescope, which measures with great accuracy the parallaxes and the movements of stars. This allowed the researchers to calibrate the data and more accurately determine the distances to Cepheids outside our galaxy.

According to new data, the Hubble constant is 73.52 ± 1.62 kilometers per second per megaparsec. This means that the galaxies we see at a distance of 10 MPC, we are fleeing at a speed of 735 miles per second, and the galaxies we see at a distance of 11 MPC – 808 kilometers per second.

This value strongly differs from the data from the Observatory, Planck, because the difference between the values ​​obtained by different methods of the Hubble constant is greater than 3.8 Sigma.