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{"id":2834,"date":"2013-04-25T15:46:01","date_gmt":"2013-04-25T13:46:01","guid":{"rendered":"https:\/\/energethique.be\/?p=2834"},"modified":"2013-04-25T15:46:01","modified_gmt":"2013-04-25T13:46:01","slug":"lhomme-marque-son-emprunte-polluante-partout","status":"publish","type":"post","link":"https:\/\/energethique.be\/2013\/lhomme-marque-son-emprunte-polluante-partout\/","title":{"rendered":"L’homme marque son emprunte polluante partout"},"content":{"rendered":"La pollution est partout sur terre et aussi en mer<\/a> mais il y a un endroit o\u00f9 l’on ne soup\u00e7onne pas encore notre impact : l’espace.
\nEn effet un peu \u00e0 l’image de la route des vacances o\u00f9 nous jetons nos m\u00e9gots, cannettes et autres papier gras la route de l’espace est parsem\u00e9e de d\u00e9bris plus ou moins grossier.
\nIl peuvent ainsi varier de quelques millim\u00e8tres \u00e0 la taille d’un bus, \u00eatre issus d’un outil oubli\u00e9 lors d’une sortie spatiale \u00e0 un \u00ab\u00a0boulon\u00a0\u00bb d’un satellite.
\nCertains proviennent des lanceurs eux m\u00eames, en g\u00e9n\u00e9ral les derniers \u00e9tages des propulseurs utilis\u00e9s pour mettre les satellites en orbite ou d’un satellite devenu inop\u00e9rationnel et laiss\u00e9 \u00e0 l’abandon.
\nEnfin les astronautes, que l’on aurait suppos\u00e9 \u00eatre des personnes s\u00e9rieuses, oublient aussi parfois leur \u00ab\u00a0pic-nic\u00a0\u00bb en route.
\nLe danger r\u00e9side un peu dans les gros d\u00e9bris mais surtout dans les d\u00e9chets millim\u00e9triques qui se forment lorsque de ces d\u00e9bris entre en collision.
\nMais ce qui les rend vraiment dangereux c’est leur \u00e9nergie cin\u00e9tique (donc induite par la vitesse) Ek=1\/2mv\u00b2, on calcule ainsi qu’une petite bille d’aluminium de 1.3 mm de diam\u00e8tre lanc\u00e9e \u00e0 10 km\/s (36 000 km\/h) a autant d’\u00e9nergie qu’une balle de 22 long rifle (a).
\nOn peut donc ais\u00e9ment imaginer les d\u00e9g\u00e2ts que cela peut faire sur un satellite, la station spatiale voire un astronaute en vadrouille !<\/p>\nAujourd’hui des scientifiques am\u00e9ricains affirment que la concentration en d\u00e9chet atteint un point critique et fait peser une menace de plus en plus grande sur les satellites et les astronautes.<\/p>\n