▁and ▁Re entry ▁Deb ris ▁Studies , ▁A eros pace ▁Corporation ▁▁▁▁ ▁News ▁item ▁summar izing ▁the ▁above ▁report ▁ ▁Steven ▁A . ▁H ild re th ▁and ▁All ison ▁Arnold . ▁Th re ats ▁to ▁U . S . ▁National ▁Security ▁Inter ests ▁in ▁Space : ▁Or b ital ▁Deb ris ▁Mit ig ation ▁and ▁Rem oval . ▁Washington , ▁D . C .: ▁Cong r essional ▁Research ▁Service , ▁ 8 ▁January ▁ 2 0 1 4 . ▁ ▁David ▁Leonard , ▁" The ▁Cl utter ▁A bove ", ▁Bul letin ▁of ▁the ▁At omic ▁Scient ists , ▁July / August ▁ 2 0 0 5 . ▁ ▁Patrick ▁Mc Daniel , ▁" A ▁Method ology ▁for ▁Est im ating ▁the ▁Un certain ty ▁in ▁the ▁Pred icted ▁Ann ual ▁R isk ▁to ▁Or bit ing ▁Space craft ▁from ▁Current ▁or ▁Pred icted ▁Space ▁Deb ris ▁Population ". ▁National ▁Def ense ▁University , ▁ 1 9 9 7 . ▁ ▁" Inter ag ency ▁Report ▁on ▁Or b ital ▁Deb ris , ▁ 1 9 9 5 ", ▁National ▁Science ▁and ▁Technology ▁Council , ▁November ▁ 1 9 9 5 . ▁ ▁Nick ol ay ▁Sm ir nov , ▁Space ▁Deb ris : ▁Haz ard ▁E valu ation ▁and ▁Mit ig ation . ▁B oca ▁R aton , ▁F L : ▁C RC ▁Press , ▁ 2 0 0 2 , ▁. ▁ ▁Richard ▁Tal c ott , ▁" How ▁We ▁J unk ed ▁Up ▁Out er ▁Space ", ▁Astronom y