The study of gamma radiation helped to more accurately calculate the actual speed of expansion of the Universe.
Scientists generally agree that the universe is expanding and that the rate of expansion is increasing, but how is the subject of ongoing scientific debate. Astrophysicists from Clemson University came up with a new way of computing called “the Hubble Constant” by exploring how gamma rays interact with background radiation of the Universe.
The Hubble constant is named after the famous astronomer who first discovered that the universe is expanding. In 1929 the first number, which Edwin Hubble (Edwin Hubble) attributed the constant was 500 km/s per megaparsec, where a megaparsec is about 3.26 m light years. Essentially, this means that more distant galaxies receding from us at higher speeds than those that are nearby.
Since the Hubble constant is constantly updated, and the last 20 years it was equal to 70 km/s per megaparsec. Team Clemson has reached a new record: 67,5 km/s per megaparsec, analyzing data from space telescopes measuring gamma-ray emissions from distant objects.
The study was published in the Astrophysical Journal.