These files collect and collate archival budget data for NASA’s various space science programs from 1959-2019 with a particular emphasis on lunar and planetary exploration. Numbers present top-line expenditures as recognized by NASA Headquarters in their annual Budget Estimates presented each year at the beginning of the Congressional appropriations cycle. Data was collected across several publicly available archival sources over the course of 2016-2019 as part of the NSF funded research project, "Pricing the Priceless Spacecraft" (Award #1633314).