Since the Hubble Space Telescope entered orbit many years ago, observations and data collected by the Hubble Space Telescope have helped scientists around the world solve the mystery. Recently, using Hubble observations, astronomers have discovered the difference between theoretical models of how dark matter should be distributed in clusters and observations of how dark matter controls clusters. < / P > < p > studying dark matter is challenging because it does not emit, absorb or reflect light. The only way scientists know it exists is through its gravitational pull on visible matter in space. Astronomers can detect dark matter by measuring how its gravity distorts space, an effect called gravitational lensing. Using Hubble observations, scientists found that the gravitational lensing effect of dark matter in star clusters is ten times stronger than expected. Evidence for stronger gravitational lensing comes from high-level detailed observations of several large galaxy clusters using the Hubble telescope and the European Southern Observatory’s very large telescope in Chile. < p > < p > large clusters are the largest repository of dark matter in the universe. These clusters are mainly held together by the gravity of dark matter. At the same time, each cluster galaxy also has dark matter. This means that the distribution of dark matter in star clusters varies from large to small. Scientists say that due to the higher than expected gravitational lensing effect, they do not capture the characteristics of the real universe in current theoretical models. This may mean that there is a gap in the current understanding of the nature and properties of dark matter, the researchers said. < p > < p > gravitational lens is an interesting phenomenon, which can distort distant background objects like an interesting mirror. This distortion sometimes produces multiple images of the same distant galaxy. The higher the concentration of dark matter in a cluster, the more dramatic the curvature of light. The above image shows dozens of multiple imaging lens background galaxies. Chinese version of K-car: reading a10e design drawing exposure