Elon Musk was expected on Tuesday to present an update on SpaceX's plan to launch missions to Mars ahead of a high-stakes Starship test flight later in the day. Musk, the world's richest person and a key supporter of U.

SpaceX is expected to launch a ninth uncrewed test flight of Starship, the most powerful rocket system ever constructed.

SpaceX says it has made significant modifications to the upper stage based on what it learned from previous flight tests and noted that while both failures occurred around the same time during the mi...