Interstellar travel by humans is a fantasy. Humans will be replaced by robots long before interstellar travel becomes possible. |
Interstellar travel by humans is a fantasy. Humans will be replaced by robots long before interstellar travel becomes possible. |
:unfortunately, it turns out that the density of interstellar hydrogen is an order of magnitude less than it was thought to be when Bussard first proposed the design. But I guess it should still be mentioned, as an idea which didn't pan out. BD |