SpaceX engineers have a million questions about the performance of these vehicles.

This weekend SpaceX engineers completed a final "flight readiness review" for the massive Super Heavy and Starship launch system, declaring the vehicle ready to make its debut test flight. SpaceX founder Elon Musk announced the decision early Sunday morning on Twitter, saying the vehicle was only "awaiting regulatory approval" before launching.

Presently, the company is targeting April 17, at 7 am local time in South Texas (12:00 UTC) for the integrated flight test of the launch system. It should be quite a show—the combination of the Super Heavy first stage and Starship upper stage is the largest and most powerful rocket ever built.