The mass of a group of giant galaxies, CL0025 and 1654, located about 4.5 billion light-years, produces a cosmic gravitational lens curving light as predicted by Einstein's theory of relativity, so that it forms more distant detectable images even that the galaxies themselves.
The total mass of the group is the sum of the galaxies themselves, seen as ordinary luminous matter, plus the invisible dark matter of the group itself, whose nature remains unknown. Analyzing the distribution of light matter and the properties of gravitational lenses due to the total mass of the group, researchers have solved the problem of locating the distribution of dark matter.
The resulting map shows the invisible dark matter in blue and the positions of the groups of galaxies in yellow. The work, based on numerous observations with the Hubble Space Telescope, reveals that the dark matter of the group is not uniformly distributed, but closely follows the accumulations of light matter.
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