Falcon Heavy is SpaceX's heavy-lift launch vehicle that has the highest payload capacity of any currently operational rocket. It consists of three Falcon 9 rocket cores whose 27 Merlin engines together generate over 5 million pounds of thrust. Falcon Heavy can lift over 64 metric tons to low Earth orbit, more than any other operational vehicle, at one-third the cost of its closest competitor. It is partially reusable and designed to carry humans into space and enable missions to the Moon and Mars.