30+ orange balls playing in Australia

In 1982 when I was 12 years old my father, mother, sister and I were returning home from my uncles farm along an unsealed road which was a short cut back to our house. There was a few houses along the road but mainly just fields where sheep, horses and cows grazed. This was our usual route home and there was rarely anything to see. In the distance we witnessed what appeared to be fireworks so as we got closer my father pulled over and stopped the car. Approximately 100 yards away we noticed that it wasn't fireworks as there was no one to ignite them and they larger perfectly rounded balls of a fiery orange color. They were the size of the inflatable "fit balls" used in gyms. These balls of orange seemed to be playing in the long dry grass. Some rose above the ground slowly and then seemed to hover 10ft in the air while others moved in rapidly in all directions. There was approximately 30 but may have been more and they all moved independently . We ! sat in the car puzzled as to what we were seeing. We watched for a few minutes as these balls of light moved everywhere and with more acceleration and at a speed I've never seen before or since. They moved up and down  and left and right,some hovering together while others moved around them. There was no noise only the lights. After several minutes of watching from inside of the car we got out of the car and as we did the balls of light scattered off and disappeared over the hill into the next gully. The speed at which they flew off over the hill was incredible. We talked all the way home about what we'd witnessed but when we went to bed that night my mother who was a school teacher said we can't tell anyone about this as only crazy people saw things like this. This happened in Australia's smallest state of Tasmania, an island state south of mainland Australia where there is no air force and limited army facilities. It was on privately owned farm land with the nearest house! a few miles away. As I was only 12 at the time I always thoug! ht I'd s ee something like this again but now nearly 40 years later I've never seen or even heard of anything like this again. All I know is that they were (1)UNIDENTIFIED (2)FLYING (3)OBJECTS