Raymond was driving as we headed towards floresville on hwy 97 near 1784. we were deep in conversation when i glanced towards the sky, which i have a habit of doing. that's when i saw the light. raymond looked and he saw the light too. we watched it for about 5 miles. it was a brilliant fluorescent green when we first noticed it. then it started changing colors. first the light changed to a bluish color, yellow, then a red orange and then finally a deep orange red color. it looked as if that part of the sky was on fire. the light slowly began to fade from the left side to the right. after the light faded, we continued looking towards the cloud to see if anything came out, but nothing did. at first, i was nervous because i hadn't seen anything like that before but then we became very interested in learning what it is. we are ufo enthusiasts and frequently stargaze looking for our universal neighbors.