In the pilot John created a wormhole just above Earths atmosphere. Its always struck me as odd that this wouldent be a problem for reality in the local vacinity. Do we ever really see Earth after John leaves other than in dreams or flashbacks?
Cant remember if they panned back to Earth after he left in the first episode. Would be quite funny at the end of the series he finds out all this time Earth has been destroyed.
Interesting.
But if you remember he was in low earth orbit which may be far enough to avoid being screwed by the wormhole although because a bizare weather condition so they may have hapened before.
Lets point out that the light scorpy sees from earth would have travelled many thousands of years so if he launches a 120cycle round trip to destroy earth he will be disapointed.