Tema Space Innovators ETF (NASA +5.22%) targets high-growth space commercialization with a concentrated, active approach, while iShares U.S. Aerospace & Defense ETF (CBOE:ITA) provides more established, lower-cost exposure to traditional defense giants. Image source: Getty Images. Investors seeking to capitalize on the final frontier must decide between focused innovation and established industrial strength. While the iShares U.S. Aerospace & Defense ETF is the more established choice with $11.8 billion in ...