Hypersonics for Space Exploration

Air flight is almost always about not having too much what we call drag force, but the force that slows you down. So tends to be high up in the atmosphere. You know, if you're coming back from space, so like when people come back from the International Space Station, that's an example of a hypersonic situation. I would say there's almost like an arms race going on right now between maybe China and Russia and the U.S. in that space.