Debris in orbit varies from millions of millimetre-sized particles to thousands of much larger objects like defunct satellites and rocket parts. As such the damage debris can cause varies from a gradual degradation of satellite parts over time to immediate and total destruction.
Find out about the damage debris can do - including leading to the "Kessler syndrome" - in episode 7 of the ESA-UN space debris podcast with Beatriz Jilete and Markus Woltran.
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