The Enduring Mystery of the Dragonfly 44 Galaxy
In 2016, astronomers led by Pieter van Dokkum of Yale University published a bombshell paper claiming the discovery of a galaxy so dim, yet so broad and heavy, that it must be almost entirely invisible. They estimated that the galaxy, dubbed Dragonfly 44, is 99.99% dark matter. A heated debate ensued about Dragonfly 44’s properties that remains unresolved. Meanwhile, more than 1…
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