Nasa has selected two concepts for a new robotic mission, one of which aims to explore potential landing sites on Saturn’s largest moon, Titan.

The concept is named Dragonfly, which is a drone-like rotorcraft that would use the environment on Titan to fly to a number of locations to sample materials and determine surface composition to examine Titan’s organic chemistry and habitability.

It also intends to monitor atmospheric and surface conditions as well as image landforms to evaluate geological processes and perform seismic studies.

The other concept, Comet Astrobiology Exploration Sample Return (CAESAR), aims to return a sample from 67P/Churyumov-Gerasimenko comet to determine its origin and history.

Selected from a set of 12 proposals, both the concepts are expected to be launched in a mission by the mid-2020s.

The proposals were submitted in April as part of Nasa’s New Frontiers programme.