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There are also two large blue-colored regions in the composite image. these blue regions are labeled as "dark matter" based on __________.

User Justin XL
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There are also two large blue-colored regions in the composite image. These blue regions are labeled as "dark matter" based on observations of gravitational lensing by the cluster.

A gravitational lens is a distribution of matter (such as a cluster of galaxies) between a distant light source and an observer, that is capable of bending the light from the source as the light travels towards the observer.

User JD Davis
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