Ground testing Huygens.
Cassini-Huygens is a joint NASA/ESA mission. NASA’s Cassini spacecraft will orbit Saturn for four years, making an extensive survey of the ringed planet. The ESA Huygens probe will be the first to land on a world in the outer Solar System - on the surface of Titan, Saturn’s largest moon. Data from Cassini and Huygens may offer clues about how life began on Earth.