I was walking outside of our property to go to another building when a mint green light about the height of a telephone poll was glowing in the yard. It was dark outside as we had no lights. The glow was lighting up the yard. I went and got a bunch of people. At the time I was 13 so everyone said to go to your room and go to bed. That light just glowed there for about 30 minutes until it faded. It also had a mist around the glow. It was about 20' X 20' and very bright.