Unknown Slow Pulsing Light object moving accross I-20We were driving from Augusta, Ga. to Aiken S.C. on US I-20 around 07:30 EST.Crossing above the interstate moving in a North-North West direction was an unknown object; this was at the first Aiken exit on I-20. The shape of object seemed long due to the pulsing lights along the side of the craft. We turned off on SC highway 19 to the south and stopped just a short ways down the road. I observed this object for around 30 minutes in a stationary position. After approx. 30 min's the object moved toward the north very slowly. One small aircraft was around as if their were watching it, but not getting to close. At least it seem that way due to the path the smaller Airplane was flying.