Comments by "Rob Fraser" (@krashd) on "Bloomberg Originals"
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They are ballistic missiles, it's not fuel that gets them to their target, it is the trajectory they were on when their engines cut out. ICBMs and SLBMs are just rockets designed to go up into space but fall back down to Earth, if you want to hit something 3,000 miles away you calculate the ballistic arc needed to make something go up and then fall back down and then the rocket stage of the weapon just has to burn sufficiently long enough for the weapon to achieve that arc, usually just the first 10 minutes of the journey since by that time the rocket would be in such low gravity that it could travel quite some distance before gravity brings it back down to Earth..
The alternative is a cruise missile, they do need to burn fuel for the entire duration of their journey and that's why most use jet engines instead of rockets, as you can't burn a rocket for a long period. A bit of trivia for you: Nazi Germany invented both the ballistic missile and the cruise missile, they used both against the UK in WW2 - The V1 was a jet-powered missile that travelled horizontally at a set altitude before falling onto it's target, the V2 was a rocket-powered missile that travelled vertically on a ballistic arc that meant it went straight up and then came straight back down, reaching it's target thanks to a very short spell at the edge of space.
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