That's the most authors I've seen on any paper. I counted 46 across 36 separate institutions.

46 authors isn’t that many. Big projects necessitate many authors (e.g. https://arxiv.org/abs/1807.06209)

In high energy physics it can easily be thousands of authors, like in the ATLAS collaboration.

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Turns out launching a gigantic camera into orbit and developing a photograph of the beginning of the universe takes teamwork.