Professor Wordsworth’s research is focused on the processes that shape planetary climate and habitability, both in the Solar System and around other stars. Currently active research topics include the nature of Mars’ atmosphere and hydrological cycle during the late Noachian (ca. 3-4 billion years ago), the rate of water loss from Earth and Venus soon after their formation, and the extent to which molecules like O2 can be treated as markers for carbon-based life in the atmospheres of rocky planets around other stars.