In 1972, Harrison Schmitt became the first (and so far only), scientist to walk on the surface of the Moon. As a practising geologist, he brought a scientific perspective to understanding lunar geology. Since then many scientists have brought their scientific insights to understanding the surfaces of comets, asteroids, the planets in the solar system and their moons.

Professor Sanjeev Gupta is amongst the geologist helping to understand the martian surface today. Not from field trips to the martian surface but from data returned by martian landers, rovers and orbiters. In this interview recorded in July during COSPAR2022 in Athens, he describes his journey from revealing how the United Kingdom became an island to making sense of martian geology.

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