Distinguish the law of air space from the law of outer space, with the delimitation debate.

The outer space = the space beyond the airspace — the region of the exploration-and-use regime: the celestial bodies (the Moon and the planets-and-asteroids) and the void between. The law's object: the activities in the exploration and use of outer space (the OST's phrase — the functional definition: the law follows the activity, not the altitude's line). The sources (the recap): the five UN treaties (the OST 1967 + the four implementing conventions), the General Assembly's principles (the soft law), the custom, the ITU's orbit-spectrum regime, the national space laws, and the private contractual ordering.