the.com/astronautics
the art of throwing humans away from Earth so violently they fall around it forever
orbit trickReaching space is easy; staying up means falling sideways fast
speed neededOrbital velocity is roughly 28000 kilometers per hour
fuel tyrannyMost of a rocket's mass is just propellant
word originGreek for sailor among the stars
thin marginsReentry heat can exceed 1600 degrees Celsius