NASA to choose between Mars lander, Comet hopper and Titan boat Wired

Nasa is pondering three potential missions as it picks its next interplanetary project. Depending on its final choice the US space agency could examine the interior of Mars, study a comet over time or float a robot boat in the icy seas of Titan.
The agency’s Discovery Program invited proposals for cosmic investigations in June 2010. The panel received 28 submissions and has now whittled the competition down to the final three. Each team will receive $3 million to further study, conceptualise and design their plans.
In 2012 Nasa will pick the winner and supply the team with a sizable budget (cost-capped at $425 million) to carry out development and embark on the mission by around 2016.