How much magic does it take to travel in space?

[MaxiDuRaritry]

Depending on the exact nature and layout of your campaign's cosmology, either planeshift or greater teleport should work. Of course, protecting yourself from alien environments (gravity or lack thereof, vacuum, radiation, toxic gases, alien diseases, etc) needs to be taken into account, as well. Adapt body takes care of most of those (although not alien diseases or complete lack of gravity).