Whitepaper #037 submitted to the Planetary Science and Astrobiology Decadal Survey 2023-2032. Topics: habitability and water; primitive bodies
Comets contain some of the most pristine ice-rich material left over from the formation of the Solar System. The D/H ratio in cometary water provides key constraints on the origin of Earth’s oceans. Measurement of this ratio in a statistically significant sample of comets is a high-priority goal for the next decade.