The meeting will highlight the importance of deep carbon science for understanding the various reservoirs of carbon in our solar system – from cores to atmospheres on Earth and other planets, and from diamonds to microbial cells. We will highlight the quantities, movements, forms and origins of carbon on Earth and elsewhere. Oral sessions and discussions will focus on the origins of carbon in all of its forms in the solar system, the knowns and unknowns of Earth’s deep carbon cycle, and the forms and functions of carbon under extreme physical, chemical and biological conditions. After discussing novel means to distinguish whether organic compounds derive from biological or abiotic processes, we will discuss the interplay of key geological and biological processes associated with abiotic synthesis of organic matter and deep life in serpentinizing systems and other relevant geological settings. We will then explore the factors limiting life at depth on Earth and the implications for interactions between carbon reservoirs and life at great depths. The final phase of the conference will address the movements of carbon from planetary interiors to atmospheres and the role of carbon recycling by subduction. The presentations will be concluded with a set of late-breaking topic presentations selected by early-career scientists from solicited abstracts and GRS submissions. Our program fortifies and strengthens the ties between disparate fields of inquiry engaged in understanding the science of deep carbon. Applications for this meeting must be submitted by May 31, 2020.