I figure mass drivers are for non-atmosphere situations. In atmosphere it seems more likely that other exotic ideas are more feasible. The longer ones seem to b

I figure mass drivers are for non-atmosphere situations. In atmosphere it seems more likely that other exotic ideas are more feasible. The longer ones seem to be for a civilization that has a construction pipeline so automated that building a multi-hundred-mile structure isn't as insane as the idea is today. The atmosphere is nice in a lot of ways, but it is not helpful in getting to space today.