One of the most important goals in the field of cosmology is to accurately measure the total amount of matter in the universe. University of California, Riverside scientists wrote in the latest issue of astrophysics journal that they used new methods to accurately measure the total amount of matter in the universe. The results show that the matter (including conventional matter and dark matter) accounts for about 31% of the total mass energy of the universe, and the “invisible” dark energy accounts for about 69% of the total mass energy. < p > < p > Muhammad Abdallah, the first author of the paper, explained that a mature way to determine the total amount of matter in the universe is to compare the number and mass of clusters per unit volume observed with the predicted results of mathematical simulation, so that we can accurately measure the total amount of matter in the universe with the number of clusters currently observed. “The higher the ratio of matter, the more clusters there are. The challenges we are facing now include two: accurate measurement of the number of clusters, which is easier to solve; and the precise measurement of the mass of clusters, which is very difficult, because most of the matter is dark matter that cannot be observed with astronomical telescopes. ” < / P > < p > in view of this, the research team first developed a tool to measure the mass of clusters by using the orbits of the galaxies that make up the cluster, thus analyzing the observation data provided by the Sloan Digital Sky Survey Telescope, and creating the open catalog of clusters galwcat19. Finally, they compared the number of clusters in the catalog with the simulation results to determine the total amount of matter in the universe. < / P > < p > the researchers combined their latest measurements with measurements from other teams using other techniques such as cosmic microwave background anisotropy, baryon acoustic oscillations, type Ia supernovae, or gravitational lenses, and concluded that matter accounts for 31.5 ± 1.3% of the total mass and energy in the universe, of which about 20% of the matter (stars, galaxies, atoms, life, etc.) is made up of Particles called baryons are made up of particles; about 80% of them are made up of dark matter. Gillian Wilson, one of the authors of the paper, said: “we have successfully used cluster technology to make one of the most accurate measurements. This is also the first use of Galaxy orbit technology, and the results obtained are consistent with those obtained by other technologies. Moreover, the great advantage of using this technique is that the mass of each cluster can be determined independently without resorting to more indirect statistical methods. ” The universe is empty. If you can do interstellar navigation in the universe, you won’t meet anything for a long, long time. There is always a gap between astronomical observation and theoretical calculation. We call the matter that hardly reacts with any other particles as dark matter, and the mysterious energy that pushes the expansion of the universe, called dark energy. By observing and calculating, scientists have already figured out the proportion of dark matter and dark energy. This time, using new measurements, the team came to a more precise conclusion: matter and dark matter account for less than a third of the universe’s mass energy. Dark energy neighbors, you so many, but so mysterious, is a profound mystery. After 12 years, “world class Super project” Shantou Bay Tunnel ushers in a historic breakthrough today

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