In just a few weeks, Elon Musk’s SpaceX company will debut the Falcon Heavy rocket, which is sure to be a huge moment in the history of space exploration. The Falcon Heavy will be, by far, the most powerful rocket in the world, and it could one day send mankind to Mars.

The launch itself is sure to be spectacular considering the incredible size of this powerful rocket. This launch, which is only to demonstrate the rocket, has been delayed and now is expected to happen in late January, and Musk suggested that people should be temper their expectations as far as the success of the launch.

“Falcon Heavy now vertical on the former Apollo 11 moon rocket launchpad,” Musk said in a Jan. 5 post on Instagram. “At 2500 tons of thrust, equal to 18 Boeing 747 aircraft at full throttle, it will be the most powerful rocket in the world by a factor of two. Excitement on launch day guaranteed, one way or another. Hold-down test fire next week. Launch end of the month.”

Musk acknowledged in a conference last year that there was a “lot of risk” associated with launching Falcon Heavy, and there was a good chance the rocket doesn’t even get to orbit. The rocket will be loaded with a Tesla Roadster playing “Space Oddity,” and it will head for orbit around Mars.