Have you noticed that when you study a star wars galaxy map carefully earth is in the unknown regions? That's all I can say.
Darth Vader's P.O.V
AS he marched up the steps of the emperors throne room Vader knew something didn't go right the empire almost never tried to meet him face to face. Tell the emperor I've arrived Vader commanded the royal guard outside palatine's room the guard nodded and said something into his comm link before letting Vader through.
The emperor was annoyed Vader knew unless he wanted to die this had to be played respectfully. He knelled down in front of palatine and said "you summoned me my lord" "yes you are take 3 command ships 14 star destroyers and 800 tie fighters to these coordinates he responded giving Vader coordinates to the unknown regions. Vader responded "yes my lord" before leaving to en mass the imperial fleet.
Time lapse
Vader stood on the bridge of his command ship looking out into the void of hyperspace. It had been nearly 4 hours since they jumped and what emerged shocked Vader. There was a fleet that didn't belong to the rebels. He was further convinced when the communications officer said the fleet is hailing us Vader said "put them through but prepare shields and the tie's" "yes my lord" the nervous officer responded. Then a human appeared on the hologram that projector. "Imperials you are ordered to surrender you vessels or be fired upon" Vader said "rebel scum eah we won't surrender to you!" "as you wish." the officer responded and suddenly a beam shot out of a weaker ship and destroyed a super star destroyer then star fighters immediately came at Vader's fleet destroying the already launched 100 ties with no damage what so ever. Vader then commanded all fighters to launch immediately.