We Must Think Outside the Rocket Equation

The rocket equation contains three variables. Given any two of these, the third becomes cast in stone. Hope, wishing, or tantrums cannot alter this result. Although a momentum balance, these variables can be cast as energies. They are the energy expenditure against gravity (often called delta V or the change in rocket velocity), the energy available in your rocket propellant (often called exhaust velocity or specific impulse), and the propellant mass fraction (how much propellant you need com...

 Hypothesizing on a World Without Stars

'Well, then, supposing there were other suns in the universe.' He broke off a little bashfully. 'I mean suns that are so far away that they're too dim to see. It sounds as if I've been reading some of that fantastic fiction, I suppose.' 'Not necessarily. Still, isn't that possibility eliminated by the fact that, according to the Law of Gravitation, they would make themselves evident by their attractive forces?' 'Not if they were far enough off,' rejoined Be...

 Sarcastic Science

Sarcastic Science, she would like to know, In her complacent ministry of fear, How we propose to get away from here When she has made things so we have to go Or be wiped out. Will she be asked to show Us how by rocket we may hope to steer To some star off there, say, a half light-year Through temperature of absolute zero? Why wait for Science to supply the how When any amateur can tell it now? The way to go away should be the same As fifty million years ago we came— If anyone remembers how ...