Last week, a 30-million-page archive of human history and civilization launched aboard a spacecraft headed for the moon.

The so-called "Lunar Library" is a small nanotech device that resembles a DVD, and it's intended as a "backup plan" so that everything we've ever learned as humans doesn't get lost in time, according to the nonprofit behind the idea, the Arch Mission Foundation.

The device is installed on Israel's Beresheet lander, which launched last week and is expected to touch down on the moon in April. Consisting of 25 nickel disks, each 40 microns thick, the archive is built to withstand space conditions. It holds a multitude of types of data explaining, well, humans.