I was walking with my family and friends in the centre of Bratislava, Slovakia. I was looking at the sky, when I saw a sphere-shaped object: I first thought that it was a star, but then I realized it was 3:00 pm and the shaped was perfect; it certainly couldn't have been a star!!!The object stood still in the air, about 800 meters from the ground, after about 10 seconds, it started moving and doing strange movements in the air. I was frightened and shocked because I had never seen something like that before. I was also curious because I continued watching it until it disappeared in the sky.