Debris in the night sky can often be attributed to space events such as the reentry of satellite parts, rocket stages, or meteor showers. Over locations like Berlin and Hamburg, it’s not unusual to occasionally observe such phenomena due to the movement and decay of artificial objects in Earth’s orbit or natural celestial activities.
If you observed debris, it is possible that there was a scheduled or unscheduled atmospheric reentry of space debris from satellites or rockets, which can produce visible streaks in the sky due to the heat and light from friction with the atmosphere. These events are monitored by space agencies and often predicted in advance, albeit not always with precise locations.
Alternatively, the debris could have been a meteor shower, which occurs as Earth passes through a field of debris left by comets or asteroids. Meteors from these showers can light up as they burn upon entering Earth’s atmosphere, appearing as bright streaks across the sky.
To determine the specifics of what was observed over Berlin or Hamburg, it may be helpful to check with local observatories, astronomy enthusiast groups, or official meteorological and space agencies that might have more precise information on recent or expected events.