SpaceX Founder, CEO, and Lead Designer Elon Musk discussed his plans for a permanent, self-sustaining human presence on Mars and the technical challenges that need to be solved in order to support a long-term presence on the red planet. Musk estimated that, using traditional methods, it would cost $10 billion per person to travel to Mars, and he wants that figure to drop to roughly $200,000 per person. Eventually, the cost of a Mars move will be below $100,000, Musk said. A large part of lowering that cost is creating spaceships with reusable parts, Musk said. The ITS' in-orbit refueling stage is crucial to SpaceX's plans, since it lowers fuel expenditures at liftoff and features fully reusable boosters, tankers and ships. Each booster can be used 1,000 times; each tanker 100 times and each ship 12 times.