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Caption (photo, p25): In this false-color image of galaxies colliding, the majority of the mass (blue) is separate from most normal matter (pink), direct evidence of dark matter. Credit: X-ray: M. Markevitch et al, CXC/NASA, CFA, Optical: STScI/NASA, D. Clowe et al, Magellan/Univ. of Arizona, Lensing Map: STScI/NASA, ESO WFI, D. Clowe et al, Magellan/Univ. of Arizona

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