Huygens on Titan: the 2005 landing that still stands as humanity’s only outer-solar-system touchdown

ESA’s Huygens lander descended through Titan’s orange haze in January 2005, touched down after about 2.5 hours, and transmitted for roughly 72 minutes from the surface; as the part of the Cassini-Huygens mission, it remains the only landing in the outer solar system to date. Titan’s thick nitrogen-rich atmosphere, frigid surface around -179 C, and the mission’s long, multi-step descent informed future exploration (e.g., NASA’s Dragonfly) and underscored the scale and distance of far-off planetary exploration; the mission cost was about $3.9 billion.