[wolfrom]

Please elaborate.

His arguments are related to interstellar travel as an endeavour that is undertaken as a gravity well to gravity well transit. My argument is that planetary colonization and travel from Earth to the close orbit of Proxima Centauri or any other star is not the only method by which humankind will reach beyond this solar system. Does that not address his arguments?

[scott_s]

He makes specific arguments regarding the time and energy requirements of interplanetary and interstellar travel. You don't address those. What you do say is too vague for me to figure out exactly what you mean.