Unusual objects emerged suddenly, resembling lights being switched on, only to gradually fade away. It’s as if the lights were being dimmed in a sequence, one after another, all within 10 to 15 seconds. What could this phenomenon be?

Unusual objects emerged suddenly, resembling lights being switched on, only to gradually fade away. It’s as if the lights were being dimmed in a sequence, one after another, all within 10 to 15 seconds. What could this phenomenon be?
What you’re describing sounds like it could be a few different things, depending on the context. If you saw these strange objects in the night sky, it might be satellites passing overhead, as they can sometimes reflect sunlight in a way that makes them appear to “turn on” and “fade out.” Another possibility is that it could be a meteor shower, where multiple meteors appear and disappear quickly.
If the objects are not in the sky, it might be some type of experimental drone or fireworks. In any case, it would be helpful to have more details about the location, time, and any other observations to narrow it down further!