'A terrible, terrible thing': NASA said India's satellite destruction created so much space junk it

[Girard442]

2. Kessler Syndrome...

...is a scenario in which the density of objects in low Earth orbit (LEO) is high enough that collisions between objects could cause a cascade where each collision generates space debris that increases the likelihood of further collisions. One implication is that the distribution of debris in orbit could render space activities and the use of satellites in specific orbital ranges impractical for many generations.

https://en.wikipedia.org/wiki/Kessler_syndrome