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Astronomers have made the expansion of the universe even more precise . After measurements lasting 6 years and carried out mainly by the NASA Hubble Space Telescope, astronomers have been able to calculate the rate of expansion of the universe to 2.3 percent. The constant that describes the extension is the Hubble constant and gives us a number that is a mileage per second for mega-parse. And most measurement methods give a value of about 70 km / c / per megapassec. These results are different from those obtained from the microwave radiation analysis of 67.8 km / sec / megaparsec. And if for ordinary people this difference may seem insignificant, astronomers are extremely significant.

They have managed to get the most out of the Hubble Space Telescope and have measured the distance to the Cephaeids with extreme precision, and in order to get a sense of the challenge, you can imagine that you are trying to measure the width of a grain of sand that is 150 km away you. "We had to measure the distance between two stars and not just one time, and thousands of times along the time to reduce the measurement error." Once they have reached the desired distance, scientists have been able to make up-to-date calculations of the universe's expansion and have received the value of 73.45 / km / s for megapassec, which is the most accurate measurement to date, and which will help understand the principles manage the extensionof the universe. And for which we will probably have to modify our physics.

Source: www.brightside.me , https://pixabay.com