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…showed last 75 words of 1567 total…effect it exerts on visible matter in the universe. As our astrophysical experiments become more sophisticated, and our understanding of large gravitational systems (galaxies and clusters of galaxies) grows, we will answer more of the questions that have faced us years. New questions about the nature and origin of dark matter are continually being put forward, ensuring that this field will be exciting, dynamic and at the forefront of astrophysical research for years to come.