The author was essentially imagining himself and his author buddies saving the world, so the solution he invented had to be much more badass:
[SPOILER]
They built a gigantic battleship-spacecraft propelled by atomic bombs.
That has apparently been seriously [url=http://en.wikipedia.org/wiki/Project_Orion_(nuclear_propulsion)]considered[/url] in real life as well. You basically shoot nukes out of the back of your spacecraft, detonate them, and ride the shockwave. Oh, and you probably need some shock absorbers at the rear end of the vehicle.
Post edited June 06, 2010 by tor