When SpaceX’s Falcon 9 rocket took off on Thursday night, it carried humanity’s entire backup plan with it. It was headed to the moon, the world’s ultimate cold-storage unit.

The Arch Mission Foundation (AMF) created the Lunar Library, a 30-million-page long compendium of humanity’s greatest cultural offerings, encoded it on a specially designed disc meant to last a billion years, and sent it to the moon to keep it safe. The disc is being carried to its final resting place on the moon’s surface aboard Beresheet, the Israeli spacecraft (and Google Lunar XPrize contender) that was carried to space by the Falcon 9, CNET reports.

The Lunar Library contains a vast archive of human history and civilization, covering all subjects, cultures, nations, languages, genres, and time periods. Everything from the contents of Wikipedia, to a compilation of human languages, the Rosetta Project, books selected by Project Gutenberg, as well as genome maps, 60,000 analog images of pages of books, photographs, illustrations, and documents, and much of the world’s greatest art, music, literature, and scientific knowledge. It’s all encoded on a disc that is composed of 25 nickel discs, each only 40 microns thick, made for the AMF by NanoArchival.

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