73 ms·

Any estimate that extrapolates known quantities of mechanisms is bound to be conservative leaving out the unlisted and unimagined changes that will dominate the

Any estimate that extrapolates known quantities of mechanisms is bound to be conservative leaving out the unlisted and unimagined changes that will dominate the needed effects.

Animats 5y ago
Not necessarily. Rockets are still bound by the tyranny of the rocket equation. Rockets have only improved slightly since the Saturn V and the Space Shuttle, both designed over half a century ago. Chemical fuels maxed out a long time ago. Fission was too risky. Fusion is still stuck. Antigravity, which was seriously discussed in the 1950s, went nowhere.