What to expect from Ark Invest's coming 'ARKX' ETF, which ignited a rally for pure-play space stocks

An artist's rendering of WorldView Legion satellites in orbit.
Maxar

Cathie Wood's Ark Invest is preparing to launch a space exploration ETF, under the ticker ARKX, and speculative trading around the sector's limited number of pure-play public companies revealed which stocks investors expect will be included.