UFO is the abbreviation of Unidentified flying object UFO, not specifically referring to alien spacecraft, but gradually being mistaken for alien spacecraft in people&;s communication. Therefore, if it is a UFO, it must exist and has been witnessed by many people. However, most UFOs are a natural phenomenon that most people are not familiar with, and a few of them can&;t be explained for the time being, while the real alien spacecraft has not enough evidence for the time being. Let&;s talk about a few UFO phenomena that I personally experienced. 1. It was a cloudy day when I was in primary school. We were having class in the classroom. I can&;t remember whether it rained or not. Suddenly, a fireball-like object flew over the glass window on one side of the classroom. Because it was seen by Yu Guang, it was not clear whether it was a fireball or a light ball. Soon, I couldn&;t hear a muffled explosion. Later, I heard that it was an explosion at a garbage transfer station not far away. Later, I remembered that it was probably spherical lightning, but there was no more evidence. 2. One summer night, watching TV at home, we lived on the seventh floor and the top floor. My home faces north and south, and I was watching TV in the south room. Suddenly I felt a light outside, as if something was flying from south to north. At this moment, the power went out, and I was a little scared and didn&;t move. After a few seconds, the electricity came and returned to normal. 3. It was still a summer. I was watching the sky on the balcony in the south of my home, and it was cloudy at that time. I found a light flashing in the sky far south, so I went back to my house and got a telescope. Through the telescope, it is found that it is behind the clouds, and there seems to be something, but only the light spot is seen, and the light spot is constantly flashing. Every time it flashes, the light spot changes place. And it doesn&;t change according to a certain law, but it shines here and there, and there is no law at all. After reading it for a while, it didn&;t change, and it didn&;t move. It was always in a fixed area. Then it seemed to disappear. 4. There is also a summer evening, about 6 or 7 o&;clock, when the sun has not completely set, playing outside with my classmates. Suddenly I saw an object flying in the sky. It was bright, not an airplane, but strangely there was a long silver track. It&;s like the wake left by a plane flying high in the sky, but this trajectory will last for a long time before it slowly disappears. Later, it was thought that it was probably the space equipment that crashed after returning to the atmosphere, and the residual fuel in it would produce this kind of phenomenon. At that time, there were not so many reports in the news, so it was impossible to be sure. The pictures are online pictures. The above are some phenomena that I have personally experienced. I like to discuss with friends who have similar experiences.