Indirect evidence builds, yet the ‘dark’ universe remains murky
A composite image of the Bullet Cluster, formed after the collision of two large clusters of galaxies. Most of the matter in the clusters (blue) is clearly separate from the normal matter (pink), giving evidence that nearly all of the matter in the clusters is dark. | Photo Credit: NASA/CXC/CfA/M. Markevitch The general theory of…
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