Investors poured more than $2 billion into the Tema Space Innovators ETF (NASDAQ:NASA) in May, making it one of the most popular thematic ETFs of the month and highlighting growing appetite for space-related investments. • What's the outlook for NASA shares?

According to FactSet data, NASA attracted $2.11 billion in net inflows during May, trailing only the Roundhill Memory ETF (BATS:DRAM) and the iShares International Country Rotation Active ETF (NASDAQ:CORO) and excludes ETFs such as Vanguard S&P 500 ETF (NYSE:VOO), iShares Core S&P 500 ETF (NYSE:IVV), State Street SPDR S&P 500 ETF Trust (NYSE:SPY) ad Invesco QQQ Trust (NASDAQ:QQQ).

The fund's assets under management climbed to roughly $2.7 billion by month-end.

The strong inflows came during a robust month for the ETF industry.

U.S.-listed ETFs gathered $199.4 billion in May, lifting year-to-date inflows to $843.2 billion and total industry assets to a record $15.7 trillion.