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What this massive rotating disk galaxy tells us about our early universe


Current models of massive galaxy formation suggest that they evolve as part of a slow growth process, gradually increasing in size through mergers with smaller galaxies and the accumulation of clumps of hot gas. This means that most galaxies should have reached massive size relatively late in the course of the Universe’s 13.8 billion years history. However, the discovery of a massive rotating disk galaxy, much like our own Milky Way, when the Universe was just 1.5 billion years old calls these models into question. The discovery that the galaxy DLA0817g — nicknamed the Wolfe Disk after the late astronomer…

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