▁removal ▁of ▁space ▁de br is ▁has ▁been ▁eval aut ed ▁by ▁the ▁Space ▁Generation ▁Ad vis ory ▁Council , ▁including ▁French ▁ast ro phys ic ist ▁F at ou m ata ▁K éb é . ▁ ▁G row th ▁mit ig ation ▁▁ ▁A ▁variety ▁of ▁technical ▁approaches ▁to ▁the ▁mit ig ation ▁of ▁the ▁growth ▁of ▁space ▁de br is ▁are ▁typically ▁undert aken ▁as ▁of ▁the ▁ 2 0 1 0 s . ▁To ▁avoid ▁excess ive ▁creation ▁of ▁artificial ▁space ▁de br is , ▁many — but ▁not ▁all — s at ell ites ▁are ▁launched ▁initially ▁into ▁elli pt ical ▁or bits ▁with ▁per ige es ▁inside ▁Earth ' s ▁atmosphere ▁so ▁the ▁orbit ▁will ▁quickly ▁decay ▁and ▁the ▁sat ell ites ▁then ▁will ▁destroy ▁themselves ▁upon ▁re entry ▁into ▁the ▁atmosphere . ▁Other ▁methods ▁are ▁use ▁for ▁space craft ▁in ▁higher ▁or bits . ▁These ▁include ▁pass iv ation ▁of ▁the ▁space craft ▁at ▁the ▁end ▁of ▁its ▁useful ▁life ; ▁as ▁well ▁as ▁use ▁of ▁upper ▁stages ▁that ▁can ▁reign ite ▁to ▁dec eler ate ▁the ▁stage ▁to ▁intention ally ▁de or bit ▁it , ▁often ▁on ▁the ▁first ▁or ▁second ▁orbit ▁following ▁payload ▁release ; ▁sat ell ites ▁that ▁can , ▁if ▁they ▁remain ▁health y ▁for ▁years , ▁de or bit ▁themselves ▁from ▁the ▁lower ▁or bits ▁around ▁Earth . ▁Other ▁sat ell ites ▁( such ▁as ▁many ▁C ube S ats ) ▁in ▁low ▁or bits ▁below ▁approximately ▁ 4 0 0 ▁km