traveling north-northeast on natchez trace,approx. one mile south of highway 13.ball of light came from right rear of vehicle to front left ,leaving gold thread in wake that lasted approx. one second.two green-gray craft appeared directly in front ,approx. 1500 feet(determined from map later).craft were green-gray.some heat-like shimmering coming from craft.observed lower left of one craft became open.inside was a vertical rotating cylinder.speed of rotation was approx. that of wood drill.observed rotation for about four seconds.area of craft located to right and above of rotating cylinder became a pale purple color.a sheet of pure silver estimated at approx.two feet in thickness appeared above both craft.silver sheet was flat with smooth but irregular edges.after silver sheet appeared over both craft for about two seconds ,both craft simply disappeared.they didn't fly away,they just disappeared.the entire event took about eight seconds.it was observed by two people.the weather conditions were post frontal with clear ,cloudless blue skies.time of event was about 9:45 9:47 approx.we both agreed that it good that we saw this together because we agreed that no one was going to believe us.please do not use or relese my name or any personal info.