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The most powerful rocket presently in service, the Delta-4 Heavy, successfully launched a U.S. surveillance satellite this morning.
The booster features three core rocket boosters and is topped with a second stage to place payloads into orbit. It is 235 feet tall (72 meters) and can carry payloads of up to 24 tons into low-Earth orbit and 11 tons to geosynchronous orbits.
SpaceX’s proposed Falcon Heavy would launch about 50 tons into low Earth orbit, making it twice as powerful, should it be built. The next obvious question, which I can’t answer at the moment, is how do these two rockets compare in terms of cost?