The possibility of reduced-time interstellar travel either by advanced extraterrestrial civilizations at present or ourselves in the future, is not fundamentally constrained by physical principles. Harold E. Puthoff More Quotes by Harold E. Puthoff More Quotes From Harold E. Puthoff Today the vacuum [of space] is not regarded as empty. It is a sea of dynamic energy, like the spray of foam near a turbulent waterfall. Harold E. Puthoff space energy sea