This rocket launch company is growing quickly. The was a time when the key players in space exploration were all government-run operations, but over the past few decades, privately run projects like SpaceX and Blue Origin have become a bigger part of the picture. Investors looking to get in on the action may wish they could buy into Elon Musk's SpaceX, but that company doesn't plan on making a public stock debut anytime soon. One space company that you can invest in is Rocket Lab USA (RKLB 12.57%). Its stoc ...