Early on Thursday morning, a Saturn V-sized rocket ignited its seven main engines, a prelude to lifting off from Earth. But then, the New Glenn rocket didn't move. And still, the engines produced their blue flame, furiously burning away methane. The thrust-to-weight of the rocket must have been in the vicinity of 1.0 to 1.2, so the booster had to burn a little liquid methane and oxygen before it could begin to climb appreciably. But finally, seconds into the mission, New Glenn did begin to climb...