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 (+/- 1.3) percent.
美加州大河分校的科家已精量了，包括暗能量(加速宇宙之神秘力量)等，占能之存69%的量能量，同提供其31.5 (+/- 1.3)%之正常及暗物，成宇宙的物量。
1. 宇宙中，暗能量及物的目分解。 (援用自原文)
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.
後者大80%是由本不的暗物成，其20%是由如、埃、行星、星及星系等，人所熟悉的粒子、原子及分子成。
“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 a paper in the Astrophysical Journal.
一篇表於美天文所《天物理》的文首要撰文人，加州大河分校物理暨天文系研究生，Mohamed Abdullah宣：「了明於上下文中的那物量，倘若宇宙中的所有物均分於整空，相於等同每立方米，大六原子的平均量密度。」
“However, since we know 80% of matter is actually dark matter, in reality, most of this matter consists not of hydrogen atoms but rather of a type of matter which cosmologists don’t yet understand.”
「不，因人知80％的物上是暗物。事上，此物大部分非由原子，而是一宇宙家尚不解的物成。」
To come with an accurate measure of the mass in the universe, the researchers developed a tool known at GalWeight to measure the mass of a galaxy cluster using the orbits of its member galaxies. They then compiled a catalogue of galaxy clusters based on the Sloan Digital Sky Survey and compared the number of clusters with the results of numerical simulations.
了得宇宙中量的精量，此些研究人了一，利用星系成道，量星系量，被GalWeight的工具。之後，他根斯隆位穹勘基，了一份星系目，且多值模的果，比了星系的量。
“We have succeeded in making one of the most precise measurements ever made using the galaxy cluster technique,” said co-author Gillian Wilson, a professor of physics and astronomy at UCR. “Moreover, this is the first use of the galaxy orbit technique which has obtained a value in agreement with those obtained by teams who used non-cluster techniques such as cosmic microwave background anisotropies, baryon acoustic oscillations, Type Ia supernovae, or gravitational lensing.”
合撰人，加州大河分校的物理及天文教授，Gillian Wilson宣：「使用星系技，他已成功得，有史以得的最精量之一。此外，是首度使用，已得使用如宇宙微波背景各向性、重子振、Ia型超新星或重力透等，非集群技所得之值，相一致的星系道技。」
Combining their results with those obtained by other researchers using different techniques, the UCR team was able to determine what they conclude is the best combined value of 31.5 percent.
合他的果其他研究人使用不同技得的果，加州大河分校的能定，他所下是31.5％的最佳合值。
原文址：https://astronomynow.com/2020/09/28/scientists-precisely-measure-total-amount-of-matter-in-the-cosmos/
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