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We didn't spend twenty years building this colony just to make it target practice for some pushy aliens! Set up some flak gun tower turrets and fortify the area with force fields and bunkers. Don't forget this is a colony and not a military base, so you'll need a place to house the colonists and recreation centers where they can forget about the perpetual bombardment from the skies.
Use your mouse to click on a building and position the turrets, houses, and shields.