Speaking at a Q&A session hosted for a Madrid university’s Master’s of Business Administration students, SpaceX President and COO Gwynne Shotwell talked for nearly an hour about the launch company’s next-generation BFR rocket, the reality of long-term life on Mars, and more, revealing a number of interesting tidbits in the process.

Almost entirely led by questions from the unusually well-informed audience, the graduate students and professors predominately kept the famous SpaceX exec more or less focused on the company’s future, delving into the reasoning behind BFR. Shotwell had only praise for the next-generation launch vehicle, which is targeting initial hop tests in late 2019 and its first full launches as early as 2021, a delay of several months from previous schedule estimates targeting hops in early 2019 and orbit by 2020.