The Arctic cannot fully be understood without including Outer Space, from low Earth orbit to distant stars. It is time for a paradigm shift in our view of the Arctic, so that we see it anew in 3D: centred on the North Pole but extending ,000s of kilometres across the top of the planet, several kilometres down into the Arctic Ocean, 35,000 kilometres up to geostationary orbit, and billions of kilometres beyond that to other galaxies and stars. In the first of his McLean Lectures in Canadian Studies, Michael Byers explains our 3D Arctic in terms of its geographical, cultural, technological, political and legal connections to Outer Space, and points out the implications these have for the disciplines of international relations, international law and political geography.