> Obviously anything less than break-even is not worth having -- a chemical ...

		ceejayoz on April 10, 2013 \| parent \| context \| favorite \| on: NASA-backed fusion engine could cut Mars trip down... > Obviously anything less than break-even is not worth having -- a chemical rocket would be more efficient. Why not? The energy to start the reactor comes from solar power, so they didn't have to carry it up with them.