THE 12th ANNUAL THE SILVER COMET HALF MARATHON & FIRST FULL MARATHON! REGISTER NOW! Race sells out! Remember why you run in the first place! This fun, beautiful, flat course running out & back on the Silver Comet Trail. Silver Comet Races are fully self supporting & give financial support to youth educational, environmental, cross country, track & field & explorer programs via partnerships w/ Cobb County Parks & Rec, Fire, Police & Schools. Perfect for first time walkers & runners.