/sci/ - Science & Math

Scientifically, what would be the implications of firing thrusters using matter-antimatter reactions to heat a deuterium reaction mass inside a planet's atmosphere, and close to the ground? What would some of the difficulties in using the ship's vast deltav reserves (say it's capable of accelerating to .7c and then slowing back down to a relative stop) and large thrust to weight ration (say in free fall it would be capable of sustaining 1.5g for months on end) to transition from orbit to a static position relative to the ground using continuous thrust, before lowering the ship into the atmosphere? Once the payload has been lowered to the ground and disconnected, how would the climb back up out of the atmosphere and turn into an unpowered orbit be best approached?