Falcon Heavy is essentially the company's Falcon 9 times three. It features three Falcon 9 first-stage boosters joined together with a second-stage on the middle one. It also has three times more engines.
The Falcon 9 is now used to hoist satellites and supplies to the International Space Station. The Heavy is intended for super-big satellites, as well as cargo destined for points far beyond, like Mars.
SpaceX advertises that the Falcon Heavy will be able to lift 140,660 pounds of cargo to low-Earth orbit, 37,040 pounds to Mars, and 7,720 pounds to Pluto.
NASA's Saturn V moon rocket, used during the late 1960s and early 1970s, will still top the charts. But none of it was reusable. NASA introduced reusability with its space shuttles in 1981, reflying the orbiters as well as booster segments and main engines until their retirement in 2011.