penarth uk circle 3mins stayed 30ft above me for 3 mins slowly moved of and then with the blink of the eye the speed was unreal

me and my mate were playing and above us was a ufo or as we called it then a spaceship it stayed above us for about 3 mins it was a circle shape with a blue band of light all around it it had 3 blue what looked like half bubbles under the craft and the thing i remember most was i could see right through the craft and there was no sound comeing from it it was about 30ft above our heads after about 3 mins it slowly made its way down towards the docks and it moved slowly along the lengh of the docks and then it just moved so fast it went out of sight in a blink as an adult now i would put the crafts size about 50ft in lentgh i ran home to tell my mother and she said dont be silly your tired i have never forgot what happend that night the only thing im not to sure about is the date give or take a year it was around that time i do know that there is other living beings out there in space because i have seen it with my own eyes.