SpaceX announced plans for one of the most ambitious private space missions to date: a crewed flyby of Mars aboard Starship, led by crypto investor and entrepreneur Chun Wang.

If carried out, the mission would mark the first time a private crew travels that far from Earth. The flight would not land on Mars, but would instead loop around the planet in a journey expected to last about two years.

The announcement was made during a livestream of a Starship launch attempt from SpaceX’s Starbase facility in Texas. Wang was introduced as commander of the future mission and confirmed that it would be a Mars flyby.