When you get to this point you will be able to defeat two Movers to retrieve a derelict one which you can use to research Anti-Mover Weapons at the Mothership. Once the Mothership has initiated its first short jump, begin moving your fleet along the path created by the dust strands near to where the circle is on the tactical screen the Mothership will reappear here and will come very quickly under attack if you don't protect it, the Movers will very quickly tear it down. Don't worry about the Movers being difficult to deal with at the start, they do get easier. These will be the only enemies you'll face in this battle, so to begin with, invest in lots of Pulsar Gunships and Torpedo Frigates (further into this scenario, Fleet Intelligence will explicitly state that you should do this). Movers are Corvette-class but they boast pretty powerful weapons and a tough hull for their size.

You have a fair amount of the time before the Hyperspace core is charged, but before that you will begin to be attacked by a new enemy, Progenitor Movers. You have lost control of the Mothership, although it can still construct things and conduct research. The Oracle has taken you here for some currently unknown reason.

Homeworld 2 remastered walkthrough