NASA just announced two finalists for its next billion-dollar robotic mission to explore mysterious corners of our solar system.
The picks for the mission, called New Frontiers-4, were chosen from a class of 12 proposals. The final winner will be chosen in 2019, NASA said.

One of the finalists, named ‘Dragonfly,’ is a lander that would head to Saturn’s moon Titan. The other, nicknamed CAESAR (which stands for Comet Astrobiology Exploration SAmple Return), would go to the Churyumov-Gerasimenko comet and collect samples.
Each team now has roughly one year to finalize their concept before NASA makes its ultimate decision.

The project would attempt to follow up on and advance the Cassini probe’s groundbreaking 13-year exploration of Saturn.

Dragonfly is a dual-quadcopter lander that would take advantage of the environment on Titan to fly to a variety of locations, some hundreds of miles apart. The lander would sample materials and determine surface composition to investigate Titan’s organic chemistry and habitability, monitor atmospheric and surface conditions, capture images of landforms to investigate geological processes, and perform seismic studies.

Here’s a rendering of CAESAR, which would fly back to a comet that the European Space Agency first explored in 2004 with its Rosetta mission. The mission would grab a sample from the nucleus of Churyumov-Gerasimenko, with the hope of learning about how these materials contributed to the early Earth, including the origins of our oceans and life.

Whichever option NASA ultimately chooses, both missions would allow deeper exploration of fascinating corners of the solar system that we already have a bit of knowledge about.