Appropriations and expenditures Astronautics and state Helium Isotopes Government policy Infection Prevention Outer space Exploration Space law Chama Valley (Colo. and N.M.) Federal aid to research Finance Fusion reactors Research Geology Helium Isotopes Supply and demand Manned space flight Government policy Manned space flight Law and legislation Manned space flight Planning National security National security Technological innovations Nuclear fusion Research Orbiting astronomical observatories Outer space Exploration Finance Outer space Exploration Planning Planning Research and development contracts, Government Space astronomy Instruments Space flight Finance Space flight Government policy Space industrialization Government policy Space launch industry Space launch industry Law and legislation United States Appropriations and expenditures, 2015