The expert on the nuts and bolts, engines, and fuel of space travel talks about how it might be done - and how the UFOs we often see might be doing it. Fission, fusion, and laser propulsion is possible (but expensive) with what we now know on Earth, but that's not the only way in the future. What produces the enormous power of quasars? What force holds sub-nuclear particles together? Is there a way to bend time and space to bounce from one place to another in the universe? Any or all of these methods, or something unimaginable now, may make it possible eventually to travel the vast distances of space like our alien counterparts.
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