What internal factors often cause on-orbit breakups of spent rocket bodies or older satellites?

Answer

Residual fuel or aging batteries exploding

A significant portion of the cataloged debris population originates not from collisions or deliberate tests, but from inherent instability within the hardware itself after missions conclude. For spent rocket bodies or satellites that have become un-maneuverable, the risk often comes from energetic internal components. Specifically, small amounts of residual propellant left in tanks, or the degradation and eventual failure of aging batteries, can lead to internal explosions years or even decades following the original mission's successful completion. These unplanned breakups contribute substantially to the creation of new, cataloged debris objects.

What internal factors often cause on-orbit breakups of spent rocket bodies or older satellites?
Spaceorbital debrissatellitesdestruction