this is the bit I don't get, if the higher orbit is slower, why does it take more energy and velocity to get there?
and conversely why is it the fastest orbit the "cheapest"
save for the fact that going from rest in an atmosphere isn't transferring from one orbit to another.
I'm specifically interested / curious about what orbit is the "cheapest" to get to from the surface (at rest)
And how to get back down without emulating a meteor !
First of all am I right in thinking that ( comparitivly ) low orbits such as the ISS need very high velocities (in the region on 17,000 mph ) and that orbits further out require less speed ?
Is there a "sweet spot" orbit that requires a minimum velocity ?
what's the minimum velocity...