SpaceX plans to launch the seventh full-scale test flight of its massive Super Heavy booster and Starship rocket Thursday afternoon. It's the first of what might be a dozen or more demonstration flights this year as SpaceX tries new things with the most powerful rocket ever built.

Elon Musk's SpaceX on Wednesday pushed back its latest orbital flight test of Starship, the colossal prototype rocket the company hopes will help humans colonize Mars.