At about 03:30 GMT on Wednesday, the sky across northern Europe was illuminated by an object zooming through the air in flames.

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The pyrotechnics were in fact caused by a Space X Falcon 9 rocket re-entering the Earth’s atmosphere. There are reports of sightings in Denmark, Sweden and England.

Pieces of the rocket then crashed into Poland and, experts say, may also have landed in Ukraine.

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The debris appears to have damaged a light fixture in [a] warehouse’s yard.

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The SpaceX Falcon 9 rocket is used to transport people and payloads into the Earth’s atmosphere. It is designed to be reusable.

The rocket which created this debris was launched by SpaceX from the Vandenberg Air Force Base in California on 1 February.

“It was supposed to re-enter the Earth’s atmosphere in a controlled manner and crash into the Pacific Ocean,” Harvard University astrophysicist Dr Jonathan McDowell [said].

"But the engine failed. We’ve seen it orbiting Earth for the past few weeks and we were anticipating an uncontrolled re-entry today, which is what people saw burning in the sky.

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Space debris from rockets and satellites re-enter the Earth’s atmosphere several times a month. Usually pieces of space debris are entirely burned up by Earth’s atmosphere but larger piece can fall to earth. According to Dr McDowell, an uncontrolled large rocket re-entry is rare and has the potential to be dangerous.

“So far, we’ve been lucky and no-one has been hurt but the more we put into the Earth’s orbit, the more likely it is that our luck will run out,” he said.

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As an addition, there has been a Q&A with a space debris expert in the U.S. about that in 2022:

Orbits will be lost—and people will die—later this decade

This radically increasing number of satellites, most of which are orbiting within 1,000 km of the Earth’s surface, comes as low-Earth orbit is ever more cluttered with debris. For example, just last month [November 2022], a Chinese Long March 6A rocket’s upper stage unexpectedly broke apart after delivering its payload into orbit. There are now more than 300 pieces of trackable debris at an altitude from 500 to 1,000 km. And in November 2021, Russia shot down its own Cosmos 1408 satellite, creating more than 1,000 fragments in orbit. NASA’s International Space Station still has to dodge this debris to this day.