If space is an ocean, the International Space Station is a raft tethered to the shore. The moon is a nearby island that we’ve visited briefly. To go any further or stay any longer, humanity needs more power.

Now, NASA may have the source: A tiny nuclear reactor called KRUSTY, for Kilopower Reactor Using Stirling Technology. (If you’re wondering if this is may be a reference to a popular animated series, its predecessor was known as DUFF).

The reactor uses nuclear fission—the energy released by splitting uranium-235 in a reactor core about the size of a paper towel— to produce 10 kilowatts of power for about ten years, which NASA says is enough energy to power several houses. Four of the reactors could power an outpost on the lunar surface.

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