Comment by mrguyorama

An uncrewed payload of 30 tons to some far off distance over the course of 100 years is the answer to how it's not really possible to colonize space?

No paper plan dependent on "pulsed nuclear propulsion" ie blowing up nukes under your ass, is anything other than pop scifi.

"Pulsed nuclear propulsion" as Project Orion described itself is an insane pie in the sky imagined idea, and itself might not be possible, and yet Daedalus and Longshot both expect orders of magnitude improvements over that?

Oh, and the hundreds of tons of propellant for this magic drive has to be mined from jupiter or something.