The Imperial-class Star Destroyer was a type of Star Destroyer widely used by the Galactic Empire and the Imperial Remnant.
The Star destroyer will be able to defend Earth and place Orbital-strikes on 'Enemy positions'.
Due to people actually creating the ship that can make the Kessel run in 12 parsecs 'Rumour' (http://www.youtube.com/watch?v=veAr5NoDnIU)
the destroyer can easily travel through space by its 'hyper drive', the Destroyer is defended by many Turbobatterys
and shield generators on the tower of the ship.
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"We have the technology"