▁of ▁property ▁damage , ▁a ▁foot - long ▁metal ▁bra cket ▁sm ashed ▁through ▁the ▁roof ▁of ▁a ▁dent ist ▁office . ▁NASA ▁war ned ▁the ▁public ▁to ▁avoid ▁contact ▁with ▁the ▁de br is ▁because ▁of ▁the ▁possible ▁presence ▁of ▁ha z ard ous ▁chemical s . ▁ 1 5 ▁years ▁after ▁the ▁failure , ▁people ▁were ▁still ▁sending ▁in ▁pieces ▁with ▁the ▁most ▁recent , ▁as ▁of ▁February ▁ 2 0 1 8 , ▁found ▁in ▁the ▁spring ▁of ▁ 2 0 1 7 . ▁▁ 2 0 0 7 : ▁air bor ne ▁de br is ▁from ▁a ▁Russian ▁sp y ▁satellite ▁was ▁seen ▁by ▁the ▁pilot ▁of ▁a ▁L AN ▁Airlines ▁Air bus ▁A 3 4 0 ▁carrying ▁ 2 7 0 ▁passengers ▁whilst ▁flying ▁over ▁the ▁Pacific ▁Ocean ▁between ▁Santiago ▁and ▁A uck land . ▁The ▁de br is ▁was ▁reported ▁within ▁ ▁of ▁the ▁aircraft . ▁ ▁Track ing ▁and ▁measurement ▁ ▁Track ing ▁from ▁the ▁ground ▁ ▁Rad ar ▁and ▁optical ▁detect ors ▁such ▁as ▁lid ar ▁are ▁the ▁main ▁tools ▁for ▁tracking ▁space ▁de br is . ▁Although ▁objects ▁under ▁ ▁have ▁reduced ▁orb ital ▁stability , ▁de br is ▁as ▁small ▁as ▁ 1   cm ▁can ▁be ▁track ed , ▁however ▁determ ining ▁or bits ▁to ▁allow ▁re - ac quisition ▁is ▁difficult . ▁Most ▁de br is ▁remain ▁un ob ser ved . ▁The ▁NASA ▁Or b ital ▁Deb ris ▁Observ atory ▁track ed ▁space ▁de br is ▁with ▁a ▁ ▁liquid