Ahead of a much anticipated IPO, SpaceX is carrying out a critical test of its giant, stainless steel rocket. Investors will be watching closely.

The launch window will open at 6:30 p.m. EDT on Tuesday, May 19, for a new version of SpaceX’s Starship megarocket to undertake a critical test flight.

Elon Musk's SpaceX this week will launch its next Starship flight, release the prospectus for its $1.75 trillion IPO. Space stocks pare gains.

SpaceX's Starship launch is postponed. A technical glitch delayed the test flight. The company aims for a new attempt on Friday. This mission is crucial for SpaceX's upcoming…