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That way people will not have to jump around so much.So don't complain if you find yourself reading the same thing twice.Vessels with names like Enterprise, Serenity, Rocinante, Discovery, Seaview .And ships that never quite made it, like the Strategic Star Command Galactic Cruiser Leif Ericson.This is clearly reflected in the increasing interest which post-World War Two sf has taken in the traditional questions of religion and in the evolution of science-fictional ideas of the Superman. Because I know if I don't, it will be just too blasted easy for you to make a mistake in units and get an answer that is a thousand times too big or small. Because the entire non-USA world in general, and the realm of science in particular uses metric. I'll try to explain things simple, so non-science types can still understand. I assume you at least know what the difference is between a planet and a galaxy.Or if you prefer, it is because I'm trying to make the equations easier for a non-rocket-scientist to use. You will have a big head-start if you've had a course in high-school physics (and didn't flunk).They are all easy enough to manage on an average scientific calculator, a computer spread sheet, or a slide rule for that matter.If needed, the reader should review the rules on Significant Figures.

If the book is out of print, second-hand copies can often be found via Book Carol Maxwell: "What makes you think you can discover anything? Think about the proud series of vessels which formed the focus for high adventure.

What I am suggesting is if you are serious about all this you would do well to also read those.

If you are using a pocket calculator, try to find the scientific kind.

Space Flight became and remained the central myth of sf because it was the ultimate window of opportunity, through which the entire Universe could be viewed – and, ultimately, known. And there are one or two pages here that have hardly any equations at all.

In genre sf, the ultimate aim of technological progress is, in the words of Mack Reynolds, "total understanding of the cosmos". I'm here to make you into steely-eyed missile people, blasting off and leaving all those trekkies choking on your rocket exhaust. Real rocket scientist know what metric units to use in rocket equations (metre—kilogram—second, centimetre—gram—second, SI). So, for the benefit of all you ground-grippers, I'm going to explicitly specify what metric units to use in each equation.

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