 Woodward presented a paper about the concept at the NASA Breakthrough Propulsion Physics Program Workshop conference in 1997, and continued to publish on this subject thereafter.Even ignoring for the moment the impact on interstellar travel, future spacecraft driven by impulse engines based on Mach effects would represent an astounding breakthrough in terms of interplanetary spaceflight alone, enabling the rapid colonization of the entire solar system.Travel times being limited only by the specific power of the available power supplies and the acceleration human physiology can endure, they would allow crews to reach any moon or planet in our solar system in less than three weeks.