Nobody can agree where space starts, and the 20 kilometres in dispute now matter to astronaut wings, space tourism and hypersonic weapons

Nobody can agree where space starts, and the 20 kilometres in dispute now matter to astronaut wings, space tourism and hypersonic weapons

The 100 km Kármán line is a 1960 convention, the physics gives different answers depending on the question, and the band in dispute now has customers and weapons in it.