Actually most of them aren’t, but instead they are only supersonic… Making hypersonic missiles (speeds over Mach 5) is a hard problem due to changes in airflow

Actually most of them aren’t, but instead they are only supersonic… Making hypersonic missiles (speeds over Mach 5) is a hard problem due to changes in airflow at that speed. https://en.wikipedia.org/wiki/Hypersonic_speed https://en.wikipedia.org/wiki/Hypersonic_speed