@dobby wrote:
I think that even at 35k ft and an artillery boost it would still need to be a rocket propelled projectile with rocket or gas jet terminal guidance, remembering you don’t need escape velocity, just intercept and the kinetic energy of the satellite does the rest. An unmanned very high alt aerostat (~100kft)with rocket propelled kinetic projectile similar to an old F-15 ASAT and other kinetic approaches were mentioned.
It must be remembered that much important stuff is kept at or near LEO for best reconnaissance and radar resolution.
The worst was a nation with heavy launch, the old fear of(Soviet) moonshot free return to get an easy and camouflaged retrograde clean sweep(oh so messy) and long term denial of standard geostationary orbit with a gob of ball bearings.