There aren’t many places you can conveniently launch a homemade rocket. But a blustery Scottish moor, reachable only by winding roads that twist around reservoirs, wind turbines, and plenty of sheep, is one of them. Every year for a week in August, a group of amateur rocketeers convene at the Fairlie Moor Rocket Site, not far from Glasgow, to blast their DIY shuttles and spaceships into the skies. This is International Rocket Week.