0 0 9 ▁event ▁involved ▁de br is ▁believed ▁to ▁be ▁a ▁ ▁piece ▁of ▁the ▁Kos mos ▁ 1 2 7 5 ▁satellite . ▁In ▁ 2 0 1 3 , ▁the ▁I SS ▁operations ▁management ▁did ▁not ▁make ▁a ▁man eu ver ▁to ▁avoid ▁any ▁de br is , ▁after ▁making ▁a ▁record ▁four ▁de br is ▁man eu vers ▁the ▁previous ▁year . ▁ ▁K ess ler ▁synd rome ▁▁ ▁The ▁K ess ler ▁synd rome , ▁proposed ▁by ▁NASA ▁scient ist ▁Donald ▁J . ▁K ess ler ▁in ▁ 1 9 7 8 , ▁is ▁a ▁theoretical ▁scenario ▁in ▁which ▁the ▁density ▁of ▁objects ▁in ▁low ▁Earth ▁orbit ▁( LE O ) ▁is ▁high ▁enough ▁that ▁coll isions ▁between ▁objects ▁could ▁cause ▁a ▁cas cade ▁effect ▁where ▁each ▁collision ▁generates ▁space ▁de br is ▁that ▁increases ▁the ▁lik elihood ▁of ▁further ▁coll isions . ▁He ▁further ▁the or ized ▁that ▁one ▁imp lication ▁if ▁this ▁were ▁to ▁occur ▁is ▁that ▁the ▁distribution ▁of ▁de br is ▁in ▁orbit ▁could ▁render ▁space ▁activities ▁and ▁the ▁use ▁of ▁sat ell ites ▁in ▁specific ▁orb ital ▁ranges ▁econom ically ▁imp ract ical ▁for ▁many ▁gener ations . ▁ ▁The ▁growth ▁in ▁the ▁number ▁of ▁objects ▁as ▁a ▁result ▁of ▁the ▁late - 1 9 9 0 s ▁studies ▁spark ed ▁debate ▁in ▁the ▁space ▁community ▁on ▁the ▁nature ▁of ▁the ▁problem ▁and ▁the ▁earlier ▁dire ▁warnings . ▁According ▁to ▁K ess ler ' s ▁ 1 9 9 1 ▁deriv ation ▁and