After setting foot on the Moon, the next destination for humankind is Mars, which presents a whole new set of challenges in speedy, long-distance space travel.
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We don’t have unlimited fuel, rockets cost too much fuel. It’s not even normal fuel either, it’s rare chemistry rocket technology that takes a while to develop.
Alright so nobody’s going to stop launching rockets realistically, there’s too much potential in space to just ignore, rdre are a way to do the same with less.