The revelation in August that a manuscript attributed to Galileo Galilei was a forgery has led to the discovery of a different book that the celebrated Italian astronomer actually did write, but under a pseudonym, a new investigation finds.

Previously unpublished notes by Galileo that were checked in the aftermath of the forgery’s discovery indicate that he was the true author of a treatise titled the “Considerazioni Astronomiche di Alimberto Mauri” — Italian for the “Astronomical Considerations of Alimberto Mauri” — which was published in 1604.

Some other scholars at the time suspected Galileo was the author of the work when it was published, although it was attributed to the pseudonym Alimberto Mauri. At the time, writing under a pseudonym was a common practice to avoid controversy. Galileo is known to have published under other aliases, but his authorship of “Considerazioni Astronomiche” had not been confirmed until now.

“It’s a full treatise, and it’s written by one of the most brilliant minds of Western science,” said Matteo Cosci(opens in new tab), a researcher in the Department of Philosophy and Cultural Heritage at the Ca’ Foscari University of Venice who made the latest discovery.

More: Forged Galileo manuscript leads experts to controversial book he secretly wrote | Live Science