When planets are close to the black hole, their material structures are torn up creating a strange centripetal nuclear fission.

星体在接近黑洞时，星体的物质结构被撕裂，这是奇怪的向心核裂变。

youdao

With increasing down-hole temperature, average track lengths also decrease, however, annealing anisotropy of fission tracks in apatite increases.

磷灰石中古裂变径迹的长度也随井温升高而减小，而磷灰石古径迹退火的各向异性却随井温升高而增大。

youdao