How can a galaxy be there without dark matter? The galaxy NGC 1052-DF2 challenges currently-known theories of galaxy formation as it negates everything we know about nature of dark matter. First identified with the Dragonfly Telephoto Array (DFA) and later observed by the Sloan Digital Sky Survey (SDSS), the NASA/ESA Hubble Space Telescope, the Gemini Observatory and the Keck Observatory, ...

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