The Breakthrough Propulsion Physics Project (BPP) was a research project funded by NASA from 1996 to 2002 to study various proposals for revolutionary methods of spacecraft propulsion that would require breakthroughs in physics before they could be realized.[1][2] The project ended in 2002, when the Advanced Space Transportation Program was reorganized and all speculative research (less than Technology readiness level 3) was cancelled.[2] During its six years of operational funding, this program received a total investment of $1.2 million.
The Breakthrough Propulsion Physics project addressed a selection of "incremental and affordable" research questions towards the overall goal of propellantless propulsion, hyperfast travel, and breakthrough propulsion methods.[3] It selected and funded five external projects, two in-house tasks and one minor grant.[2] At the end of the project, conclusions into fourteen topics, including these funded projects, were summarized by program manager Marc G. Millis.[1] Of these, six research avenues were found to be nonviable, four were identified as opportunities for continued research, and four remain unresolved.[1][3]
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