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Scientists precisely measure total amount of matter in the cosmos

Posted On: 28 Sep 2020   |   Posted By: Astronomy Now

Scientists precisely measure total amount of matter in the cosmos

The breakdown of dark energy and matter, both normal and dark, in the universe. Image: UCR/Mohamed Abdullah
Scientists at the University of California at Riverside have precisely measured the total amount of matter making up the cosmos, concluding that dark energy, the mysterious force speeding up the expansion of the universe, accounts for 69 percent of the total mass-energy budget with normal and dark matter contributing the remaining 31.5 percent.
Some 80 percent of the latter is made up of dark matter, the nature of which is unknown, with the remaining 20 percent made up of the particles, atoms and molecules familiar to human beings as gas, dust, planets, stars and galaxies.
“To put that amount of matter in context, if all the matter in the universe were spread out evenly across space, it would correspond to an average mass density equal to only about six hydrogen atoms per cubic meter,” said Mohamed Abdullah, a graduate student in the UCR Department of Physics and Astronomy and lead author of...

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