> Getting up in altitude is the cheapest part of getting in orbit Think about it this way: The 30th second of a rocket flight consumes less fuel than the first

> Getting up in altitude is the cheapest part of getting in orbit Think about it this way: The 30th second of a rocket flight consumes less fuel than the first second because you are carrying 30 seconds less of fuel. https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation https://en.wikipedia.org/wiki/Tsiolkovsky_rocket_equation