Space Bridge Too Far

Watching the original "Transformers" now and again with the boys, I keep wondering: why the hell did the Autobots never build their own space bridge? How is it that the Decepticons had no problem whipping one up, but the Autobots never were able to? Are the Decepticons more intelligent? I mean, who designed their space bridge, anyway? For all the engineering acumen of Wheeljack and Ratchet, who is their equivalent among the Decepticons? I dunno. All I know is that the Decepticons sure seem sharper than their Autobot enemies.