TY - RPRT TI - Propulsion Technology Assessment: Science & Enabling Technologies to Explore the Interstellar Medium AU - Hopkins, Randall C. AU - Thomas, Herbert D. AU - Wiegmann, Bruce M. AU - Heaton, Andrew F. AU - Johnson, Les AU - Baysinger, Michael F. AU - Beers, Benjamin R. PY - 2015 UR - https://ntrs.nasa.gov/citations/20150021415 ID - 20150021415 ER -