Crew or equipment visible
Incorrectly regarded as goofs
It would also explode underground and probably do little damage. But there is nothing to indicate that Ra knows where the Earth-based Stargate is, so that much is reasonable. Ra obviously added power to the bomb in order to overload the Stargate at earth causing an explosion bigger than the bomb. Although these point were only giving in SG1, the audience would have no idea about what the gate was made of or how it would react to a nuclear blast.