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A '''hypersonic missile''' travels at extremely high speed, typically at Mach 5 (five times the speed of sound, 3,800 mph) or greater, which makes them more difficult to shoot down with a [[missile defense system]].

A '''hypersonic missile''' travels at extremely high speed, typically at Mach 5 (five times the speed of sound, 3,800 mph) or greater, which makes them more difficult to shoot down with a [[missile defense system]].

[[China]], [[Russia]] and [[Iran]] have developed this technology. The Russian [[Kinzhal]] (''Dagger'') is the most famous combat tested hypersonic missile. In the [[United States]], former SpaceX employees founded Castelion, which is a for-[[profit]] [[private-sector]] company attempting to develop this advanced [[technology]].<ref>https://techcrunch.com/2025/07/03/castelion-raises-350m-series-b-to-scale-hypersonic-missile-business/</ref>  

[[China]], [[Russia]] and [[Iran]] have developed this [[technology]]. The Russian [[Kinzhal]] (''Dagger'') is the most famous combat tested hypersonic missile. In the [[United States]], former SpaceX employees founded Castelion, which is a for-[[profit]] [[private-sector]] company attempting to develop this advanced [[technology]].<ref>https://techcrunch.com/2025/07/03/castelion-raises-350m-series-b-to-scale-hypersonic-missile-business/</ref>  

==Nomenclature==

==Nomenclature==