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.
At 12.8 billion light-years from Earth, it is currently the most distant disk galaxy ever observed.
© ALMA (ESO/NAOJ/NRAO)The existence of early rotating massive galaxies rich in gas has been suggested by previous research, but this is the first clear evidence of such a galaxy.
“Such a well-formed system contradicts many, although not all, simulations of galaxy formation at early times.”Who’s afraid of the Big Bad Wolfe Disk?
“It must be one of the most productive disk galaxies in the early universe,” adds Prochaska.

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