Mystery of galaxy’s missing dark matter solved. (And it involves a thief.)

A small, mysterious galaxy 44 million light-years away is finally yielding up its secrets. Revealed last year to have a shockingly low amount of dark matter, the galaxy NGC 1052-DF4 posed a significant challenge to our models of galaxy formation.

Those models yet live another day. According to new research, NGC 1052-DF4 is indeed lacking in dark matter – but only because another nearby galaxy nicked it.

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