SpaceX CEO Elon Musk has unveiled the design for the giant rocket booster he wants to build in order to colonize Mars. It is part of what SpaceX is referring to as the “Mars Vehicle” — the rocket booster and the Mars spaceship combined — and Musk announced it on stage in Guadalajara, Mexico at the 67th International Astronautical Conference.

 The massive, single-core rocket will be responsible for launching a huge spaceship filled with 100 metric tons of passengers and cargo from Earth. To do this, it is capable of generating 28,730,000 pounds of thrust at liftoff, resulting in a top speed of about 5,375 miles per hour. It will use 42 of SpaceX’s new Raptor engines, the first of which was tested earlier .

By making the rocket reusable instead of discarding it after every launch, Musk said SpaceX hopes to some day make the cost of going to Mars about the same as buying a house. For cargo, he said he hopes to get the cost down to about $140,000 per ton.

priorthe secret rocket had been codenamed the BFR — for Big Fucking Rocket — a reference to a giant gun called the BFG in the video game Doom. And given the rocket’s size, it’s easy to see how it got that nickname.