Falcon Heavy is another working, reuseable rocket similar to Falcon 9. However, the Falcon Heavy has a three-core system for its first part instead of the single-core design of the Falcon 9. With the three cores, the rocket's 1st part has 27 Merlin engines. The second part still only has 1 Merlin(Vacuum Version) engine. Currently, Falcon Heavy is the world's most powerful operating rocket and the 4th most powerful rocket in the world. This added power allows the rocket to be able to put 63,800 kg (140,660 lb) into low earth orbit, and 26,700 kg (58,860 lb) into geosynchronous orbit.