Scientists have calculated the amount of light produced by the stars in the entire history of our Universe

Scientists have calculated the amount of light produced by the stars for virtually the entire history of our Universe, which, according to current estimates, about 13.7 billion years. This was reported by “Popular mechanics”.

According to Marco Aiello (Marco Ajello), astrophysics from Clemson University, SC, USA, lead author of the new work, this has never been done. According to their calculations in the entire history of the universe was born about a trillion trillion stars. They rejected 4 x 1084 photons, or, if otherwise— 4 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 000 photons.

It is noted that the calculations researched made on the basis of measurements of the extragalactic background radiation (extragalactic background light (EBL)) — radiation accumulated since the birth of the first stars. With the help of the space telescope Fermi used the light from blazers (active galactic nuclei with relativistic jets directed towards the observer) as a “backlight” for the EBL.

Scientists have studied radiation 739 blazers, some relatively close to us, others very distant, the rays which traveled to Earth billions of years. The photons of gamma radiation passing through the EBL, with a high probability can be absorbed, so that by studying blazey at different distance from the Ground and assessing what amount of radiation was lost “along the way”, the researchers were able to calculate the total amount of starlight at different periods.

“We calculated the total amount of light of stars for each epoch a billion years ago, two billion years ago, six billion years ago, up to the period when began to form the first stars,” said Vaidehi char (Vaidehi Paliya), co-author of the new work.

According to scientists, the peak of star formation occurred about 11 billion years ago — since then, the rate of formation of new stars is gradually reduced. At the moment, according to the calculations, in the milky Way are born each year about seven new stars.

Work on the new study were published in the journal Science, briefly about its results reported in a press release on EurekAlert!

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