Production and detection of carbon dioxide on Iapetus

► CO2 cannot remain on Iapetus due to both sublimation and photodissociation. ► CO2 is only found on Iapetus in the dark terrain. ► CO2 was produced in the lab with a mixture of water ice and carbon grains when exposed to UV light. ► The CO2 extrapolated lab production rate is similar to the loss rate.