The Earth is much larger than most people realize. You need to use engines if you want to efficiently navigate large sections of the planet. Everything from cars to planes relies on engines, but they ...

Scientists and engineers are diligently working on innovative concepts to make the next era of human spaceflight more powerful and more efficient using nuclear propulsion. One of these designs, known ...

I think you need to do some background reading. I'd suggest looking at the first two or three sections of this page on types of rocket engines. Stop at pressure-fed engines; the details of the ...