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ReaperofFish t1_j10s0q2 wrote

Define efficient.

Generational ships are the obvious answer. Big city or nation sized ships that contain a very large population of people and animals and plants. Rotate the ship, and slowly cruise out to your destination. The people that board will never see the destination, but maybe their many great-grandchildren will. Hollow out a large asteroid or build an O'Neill cylinder.

https://en.wikipedia.org/wiki/Generation_ship

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Bipogram t1_j10x0or wrote

And drive it with several world's supplies of fission devices - the Rocket Equation takes no prisoners.

:\

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comcain2 t1_j1168zu wrote

Yup, I was just thinking of Project Orion.

Cheers

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