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Third missile test this month. let's get more. cnn's will ripley is in taipei. explain to viewers what is exactly a hypersonic missile and how worried, if they're worried at all, is the region to news that north korea has this technology and is testing it? >> reporter: hi, isa. both very good questions. because a lot of us haven't really heard of hypersonic missiles because they're actually pretty rare. only two countries right now are known to have them deployed. that would be china and russia. the united states is also developing and testing hypersonic missile technology. hypersonic by def...

In power. analysts say the wasong-8 could be unlike any other missile he's tested before. exact specifications unknown. hypersonic missiles can fly more than five times the speed of sound, roughly 4,000 miles an hour or about a mile every second. at that speed, a missile could fly from pyongyang to washington in less than two hours. some hypersonic weapons can theoretically fly four times faster, up to 20 times the speed of sound. many ballistic missiles already fly at hypersonic speeds. but they follow a set trajectory from point a to point b. north korea says this new missile has a hypersoni...