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Smithsonian Magazine on MSNCheck Out NASA's New Image of the Brilliant Bullseye Galaxy, the Aftermath of a Rare Cosmic CollisionAround 50 million years ago, a blue dwarf galaxy shot through the center of an enormous galaxy more than twice the size of ...
In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...
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