Explainer: What is a hypersonic missile?

Описание: Iran is the latest country working to acquire hypersonic missiles.
But what are they and how difficult is it to build them?
Hypersonic missiles move at five times the speed of sound or greater and are manoeuvrable, making them difficult for defence systems and radars to target.
The United States, Russia, China and North Korea are believed to be the only countries to have successfully tested hypersonic missiles, but exact details of the weaponry remain scant.

Al Jazeera’s Alex Gatopoulos explains.

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