Thank God It's Friday... Again - S1-E6
Visible crew/equipment: After Aeryn extracts the worm from John's abdomen, when Rygel says, "If I were warmer, I would have an appropriately venomous reply. Be warned, I owe you one," he drops down off the table, and as Rygel waddles away the boom mic dips into view at the top right side of the screen.
Chosen answer: It's never explained. John mentions a theory that his less technologically developed craft simply interferes with the wormhole less than the "superior" Vipers, but they never make a concrete determination on that point. But we also have to take into account the fact that Moya traverses wormholes with no ill effect as well.
Garlonuss ★