text: In most respects, they're pretty close.  (Details of the 747 vary by model.)\n\nThe wingspan of the 747-400ER, a current model, is over 211 feet.  The wingspan of the Galaxy (C-5a) is about 223 feet.\n\nThe 747-400ER is about 232 feet long.  The Galaxy is about 247 feet long.\n\nThe heights are about the same, at almost 64 feet for the 747-400ER and about 65 feet for the Galaxy.\n\nThe maximum takeoff weight for the 747-400ER is 910,000 pounds; for the Galaxy, it's 840,000.\n\nBoeing has announced a bigger version of the 747, the 747-8.  It will have a wingspan of almost 225 feet, a length of as much as 250 feet, and a height between 63 and 64 feet.  The maximum takeoff weight will be 960,000 pounds.\n\nBut, even though the new 747 will be definitely bigger, it still won't have the cool front-and-rear cargo ramps and a cargo bay big enough to drive a tank through, like the Galaxy does.