orbital mechanics
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Hitting the Books: How to huck a human into low Earth orbit
Paul Dye knows a thing or two about spaceflight. His new book "Shuttle, Houston" pulls back the curtain on the incalculable efforts needed to put people in space.
Wannabe Elon Musks can 3D print their virtual spaceships
If you think you've got a bright future in spaceship design, the Kerbal Space Program simulator will quickly humble you -- beneath the playful surface is an accurate, unforgiving physics system. The lucky few that manage to get their virtual craft in orbit or beyond can't be blamed if they'd like to commemorate the achievement. A printing company called Eucl3D now lets you do exactly that in PVC -- all you have to do is upload your Kerbal .craft files, and for $99, you'll get a plastic replica of your ship.
