New Horizons’ primary mission is complete. It’s already completed its pass through the Pluto system and even stopped by 486958 Arrokoth, a Kuiper belt object on its way out of the solar system. But that doesn’t mean it’s done providing new scientific insights. A new paper looks at data collected by its ultraviolet spectrograph, which looked at one particular wavelength and helped provide context to a few different questions about the solar system.