Cassini-Huygens, a flagship-style NASA mission to the Saturn system, was nearly 20 years in the making. The final product, Cassini-Huygens, was a joint venture between NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI). The mission consisted of two basic parts: The Cassini orbiter, named after a famous Italian-French astronomer, was built by NASA; the Huygens space probe, named after a famous Dutch astronomer, was built by ESA. ASI built the high-gain antenna for Cassini, as well as the radar system used to see through Titan’s clouds. The mission focused on Saturn and its large moon Titan.