Nasa picks finalists to explore comet, Saturn's moon

The CAESAR (Comet Astrobiology Exploration Sample Return) mission will acquire a sample from the nucleus of comet Churyumov-Gerasimenko, returning it safely to Earth.
The CAESAR (Comet Astrobiology Exploration Sample Return) mission will acquire a sample from the nucleus of comet Churyumov-Gerasimenko, returning it safely to Earth. PHOTO: NASA
Dragonfly is a dual-quadcopter lander that would take advantage of the environment on Saturn's moon Titan to fly to multiple locations to sample materials and determine surface composition.
Dragonfly is a dual-quadcopter lander that would take advantage of the environment on Saturn's moon Titan to fly to multiple locations to sample materials and determine surface composition. PHOTO: NASA