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Scientists Look To The Skies To Estimate How Fast Universe Is Expanding



 cta telescopes in southern hemisphere
This image from the Cherenkov telescope array illustrates all three classes of the 99 telescopes planned for the southern hemisphere at ESO's Paranal Observatory, as viewed from the center of the array. CTAO / MA. Besel / IAC (G.P. Diaz) / ESO

The Hubble Constant is one of the most important concepts in astronomy.

Many different figures have been presented over the years, based on different data analyzes. A recent estimate based on data from the Hubble Space Telescope found the constant to be in the region of 74 kilometers per second per megaparsec.

Now that a new paper has been used, it is estimated that the number of megacarps is about 3.26 million light-years different technique to estimate the constant and slightly slower rate of expansion of 67.5 kilometers per second per megaparsec. The Extragalactic Background Light (EBL) is called the Extragalactic Background Light (EBL).

The scientists studied the rate of attenuation to figure out the gamma rays had traveled. If they were highly attenuated, they must have further, pointing faster expansion. If they were less attenuated, the expansion must be slower. They collected data using the Fermi Gamma-ray Space Telescope and Imaging Atmospheric Cherenkov Telescopes, like those in the Cherenkov Telescope Array pictured above.

"Cosmology is about the evolution of our universe ̵

1; how it evolves in the past, what it co-author Marco Ajello, an associate professor at the Clemson University department of physics and astronomy, said in a statement. "Our knowledge on a number of parameters – including the Hubble Constant – that we strive to measure as precisely as possible.

The findings are published in the Astrophysical Journal. [19659010] Editors' Recommendations







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