(Bloomberg) -- Space-launch company Rocket Lab USA Inc. agreed to merge with Vector Acquisition Corp., becoming the latest startup to go public through a so-called blank-check company. The combination values Rocket Lab at $4.1 billion including debt, according to a statement Monday. The combined company will have about $750 million in cash. The funding will help Rocket Lab develop a launch vehicle that can reach megaconstellations, go to deep space and serve human space missions.