A US aerospace and defense company has taken a huge step towards operational hypersonic systems after recently completing a total of 10 consecutive flights with a reusable liquid rocket engine. Colorado-based Ursa Major offers flight-proven capabilities for hypersonics, solid rocket motors, space mobility, and launch. And its Hadley engine has now flown 10 times, several of which at sustained hypersonic speeds with Stratolaunch, a private US aer…