The five: Nasa research probes

As Saturn's moon Titan becomes Nasa's latest destination, we look at other probes the agency is boldly sending forth

As announced last month, Nasa is sending a drone named the Dragonfly to explore Saturn's largest moon, Titan. Part of their New Frontiers programme to explore the solar system's biochemical relationships, the Dragonfly is scheduled to launch in 2026 and arrive at the icy moon in 2034. Development costs have peaked at $850m. Titan has "all the ingredients for life", says Lori Glaze, director of Nasa's planetary science division.