The total volume of light emitted by the Universe has been calculated. Free Technical Library News

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Calculated the total amount of light emitted by the universe

29.11.2018

Our Universe - at least that part of it that we know - has been creating and transforming stars and other cosmic bodies for 13 billion years. And if earlier astronomers were very interested in the question of how many stars existed during this time, then at the moment they are more interested in the mystery of how much light these stars emitted. Using a new method to systematically count the light from blazars, a NASA team today came up with this figure, which in itself seems quite huge and one can only guess what it is in the context of a part of the universe that is not yet accessible to us.

Having made simulation calculations for the last 13 billion years, scientists got a figure of 4x10^84 - this means that after the number 4 there are 84 zeros, which is 4 septenvigintillion light rays. However, readers will probably have a question about how, in a fantastic way, scientists managed to get such a number? In fact, there is nothing particularly fantastic here - they simply used data from the super-powerful Fermi Gamma telescope over the past nine years and analyzed how gamma rays from blazars interact with the so-called "cosmic fog", at the output they found the total amount of light produced by stars.

This fog - known as extragalactic backlight - is made up of all the light produced by stars across the entire ultraviolet and infrared wavelength spectrum. When gamma rays pass through the fog, they collide with other light waves, they produce positrons and electrons.

By studying the signatures of these elements from gamma rays from more than 739 blazars, astronomers have been able to measure the fog's density at any viewable point, as well as at any time point in its progress and development - not without the help of computer simulations, of course. Thus, the new improved measuring method allows you to measure the most accurate and hidden indicator of the Universe, revealing its mysteries and secrets.

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