The SpaceX CEO bailed on a company discussion about colonizing Mars, an otherwise favorite topic for the billionaire.

Two days after the latest in a string of test-flight setbacks for his big new Mars spacecraft, Starship, Elon Musk said on Thursday he foresees the futuristic vehicle making its first uncrewed voyage to the red planet at the end of next year.

Elon Musk presented a detailed Starship development timeline in a video posted online by his Los Angeles area-based rocket company, SpaceX.