Interlune, a Seattle startup, is developing technology to extract helium-3 from the lunar surface, a resource that has accumulated over millennia from solar wind. The Moon lacks a magnetic field and atmosphere, allowing solar wind particles to embed directly into the lunar soil, or regolith. Helium-3 concentrations are low, around 10 to 20 parts per billion in titanium-rich soils, but far higher than on Earth. The company plans to test its extraction process in a simulated lunar environment, aiming to replicate 15,000 years of solar wind deposition in just four hours.