Retail investors are rushing into the space investing trade ahead of the SpaceX IPO , and one ETF has cashed in on the excitement. Tema ETFs' Space Innovators ETF, which launched on March 30 and trades under the ticker symbol NASA , crossed $1 billion in assets in just 37 trading days, and by the end of this past trading week, had reached over $2.6 billion in assets. That rapid rise is due in part to retail investors hunting for exposure to SpaceX before it goes public. While SpaceX has taken