{"id":1105990,"date":"2020-05-13T10:19:42","date_gmt":"2020-05-13T09:19:42","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=1105990"},"modified":"2020-05-13T10:19:42","modified_gmt":"2020-05-13T09:19:42","slug":"starlink-les-dommages-collateraux-de-la-flotte-de-satellites-delon-musk","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2020\/05\/starlink-les-dommages-collateraux-de-la-flotte-de-satellites-delon-musk\/","title":{"rendered":"Starlink : les dommages collat\u00e9raux de la flotte de satellites d\u2019Elon Musk"},"content":{"rendered":"<p><a href=\"https:\/\/theconversation.com\/profiles\/roland-lehoucq-873450\">Roland Lehoucq<\/a>, <em><a href=\"https:\/\/theconversation.com\/institutions\/commissariat-a-lenergie-atomique-et-aux-energies-alternatives-cea-2395\">Commissariat \u00e0 l\u2019\u00e9nergie atomique et aux \u00e9nergies alternatives (CEA)<\/a><\/em> et <a href=\"https:\/\/theconversation.com\/profiles\/francois-graner-1062071\">Fran\u00e7ois Graner<\/a>, <em><a href=\"https:\/\/theconversation.com\/institutions\/universite-de-paris-4263\">Universit\u00e9 de Paris<\/a><\/em><\/p>\n<p>Au-dessus de nos t\u00eates est en train de se jouer une partie d\u2019\u00e9checs invisible mais dont les cons\u00e9quences sont immenses. Les <a href=\"https:\/\/www.spacex.com\/sites\/spacex\/files\/sixth_starlink_mission_overview_0.pdf\">18 mars<\/a> et <a href=\"https:\/\/www.spacex.com\/sites\/spacex\/files\/seventh_starlink_mission_overview_0.pdf\">22 avril<\/a> 2020, deux fus\u00e9es de la soci\u00e9t\u00e9 SpaceX, propri\u00e9t\u00e9 du milliardaire Elon Musk, ont chacune mis en orbite soixante satellites. Ces lancements sont les sixi\u00e8me et septi\u00e8me d\u2019une s\u00e9rie visant <a href=\"https:\/\/spaceflightnow.com\/2020\/04\/21\/spacex-modifies-starlink-network-design-as-another-60-satellites-gear-up-for-launch\/\">\u00e0 disposer rapidement de 1 584 satellites<\/a>, et un nouveau lancement est <a href=\"https:\/\/spaceflightnow.com\/launch-schedule\/\">pr\u00e9vu en mai<\/a>.<\/p>\n<p>L\u2019objectif est de constituer un r\u00e9seau de satellites, baptis\u00e9 \u00ab le lien des \u00e9toiles \u00bb (<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Starlink\">Starlink<\/a>), capable d\u2019assurer \u00e0 tous les Terriens (solvables) un acc\u00e8s \u00e0 haut d\u00e9bit au r\u00e9seau Internet. En 2025, Starlink devrait disposer de 11 943 satellites <a href=\"https:\/\/spacdenews.com\/fcc-oks-lower-orbit-for-some-starlink-satellites\/\">pour couvrir enti\u00e8rement la plan\u00e8te<\/a>, avec un objectif ult\u00e9rieur de 42 000 s\u2019il en obtient l\u2019autorisation. Ces nombres faramineux sont \u00e0 comparer aux quelque 8 000 satellites que l\u2019humanit\u00e9 a d\u00e9j\u00e0 mis en orbite depuis le tout premier Sputnik sovi\u00e9tique, <a href=\"https:\/\/www.ucsusa.org\/resources\/satellite-database\">dont 2 218 sont encore op\u00e9rationnels<\/a>.<\/p>\n<p><strong>Pollution lumineuse et embouteillage en orbite<\/strong><\/p>\n<p>Clich\u00e9s \u00e0 l\u2019appui, les astronomes professionnels <a href=\"https:\/\/www.pourlascience.fr\/sd\/astronomie\/starlink-un-cauchemar-pour-les-astronomes-18885.php\">ont d\u00e9j\u00e0 vivement protest\u00e9<\/a> contre la pollution lumineuse : en traversant le ciel, les satellites Starlink <a href=\"https:\/\/arxiv.org\/abs\/2003.01992\">laissent<\/a> de <a href=\"https:\/\/arxiv.org\/abs\/2003.07446\">longues<\/a> <a href=\"https:\/\/arxiv.org\/pdf\/2001.10952.pdf\">tra\u00een\u00e9es<\/a> sur les images astronomiques au point de les rendre inutilisables. Dans son <a href=\"https:\/\/www.youtube.com\/watch?v=HPV8Xp3pEpI\">intervention<\/a> du 9 mars \u00e0 la conf\u00e9rence Satellite 2020, Elon Musk balaye ces inqui\u00e9tudes, se disant convaincu que ses satellites n\u2019auront aucune cons\u00e9quence sur les d\u00e9couvertes astronomiques et que, s\u2019il le faut, leur surface sera peinte en noir. Le test effectu\u00e9 sur le satellite 1130 \u00ab DarkSat \u00bb <a href=\"https:\/\/www.youtube.com\/watch?v=6E_qyAyvugA\">n\u2019est gu\u00e8re convaincant<\/a>. Le mod\u00e8le suivant est pr\u00e9vu pour \u00eatre <a href=\"https:\/\/fcc.report\/IBFS\/SAT-MOD-20200417-00037\/2274315.pdf\">sous le seuil de visibilit\u00e9 \u00e0 l&rsquo;oeil nu<\/a>, ce qui est encore trop brillant pour les instruments ultra-sensibles des astronomes, capables d\u2019observer des astres <a href=\"https:\/\/www.eso.org\/public\/france\/teles-instr\/paranal-observatory\/vlt\/?lang\">quatre milliards de fois plus faibles que ce seuil<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/www.pressenza.com\/wp-content\/uploads\/2020\/05\/starlink-flotte-satellites2.jpg\" width=\"1200\" height=\"1086\" \/><\/p>\n<figure class=\"align-center \"><figcaption><span class=\"caption\">Satellites Starlink imag\u00e9s par le DELVE Survey du Cerro Tololo Inter-American Observatory, dont le but est l\u2019observation des galaxies le plus t\u00e9nues.<\/span><br \/>\n<span class=\"attribution\"><a class=\"source\" href=\"https:\/\/nationalastro.org\/wp-content\/uploads\/2019\/11\/D00908899_i_r5001p01-CC-cleaned-2-2.jpg\">National Optical-Infrared Astronomy Research Laboratory\/CTIO\/AURA\/DELVE<\/a>, <a class=\"license\" href=\"http:\/\/creativecommons.org\/licenses\/by\/4.0\/\">CC BY<\/a><\/span><\/figcaption><\/figure>\n<p>Les autres op\u00e9rateurs de satellites sont aussi inquiets. La r\u00e9gion des <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Orbite_terrestre_basse\">orbites terrestres basses<\/a>, d\u00e9j\u00e0 utilis\u00e9es par les satellites de t\u00e9l\u00e9d\u00e9tection, de t\u00e9l\u00e9communications et scientifiques, mais aussi par la station spatiale internationale, va clairement \u00eatre embouteill\u00e9e. L\u2019<a href=\"https:\/\/www.lemonde.fr\/sciences\/article\/2020\/02\/18\/l-espace-sous-la-menace-des-megaconstellations-de-satellites_6029902_1650684.html\">augmentation probable des collisions spatiales<\/a> et la <a href=\"https:\/\/skyandtelescope.org\/astronomy-news\/starlink-space-debris\/\">multiplication des d\u00e9bris<\/a> qui en r\u00e9sultera, pourraient rendre inutilisables les orbites basses et l\u2019environnement spatial proche. Le premier incident a d\u00e9j\u00e0 eu lieu : le 2 septembre 2019, l\u2019Agence spatiale europ\u00e9enne <a href=\"https:\/\/www.esa.int\/Safety_Security\/ESA_spacecraft_dodges_large_constellation\">a d\u00fb man\u0153uvrer un de ses satellites<\/a> d\u2019observation de la Terre pour \u00e9viter une potentielle collision avec un des engins de Starlink. Elon Musk r\u00e9pond que tous ses satellites sont dot\u00e9s de propulseurs capables de les faire retomber sur Terre en fin de vie.<\/p>\n<p><strong>D\u00e9chets dans l\u2019espace, d\u00e9chets sur Terre<\/strong><\/p>\n<p>D\u2019autres inconv\u00e9nients sont plus difficiles \u00e0 corriger, et sans doute plus graves encore. Depuis le premier lancement, six satellites sont d\u00e9j\u00e0 <a href=\"https:\/\/advanced-television.com\/2020\/04\/07\/some-of-musks-starlink-satellites-failing\/\">hors service<\/a>. Si seulement un dixi\u00e8me des satellites de Starlink tombaient en panne durant leur vie op\u00e9rationnelle estim\u00e9e de 5 \u00e0 7 ans, cela ajouterait plusieurs milliers de d\u00e9bris spatiaux aux <a href=\"https:\/\/orbitaldebris.jsc.nasa.gov\/quarterly-news\/pdfs\/odqnv24i1.pdf\">20 000 qui font d\u00e9j\u00e0 l\u2019objet d\u2019une surveillance<\/a>. Les op\u00e9rateurs spatiaux priv\u00e9s \u00e9tant soumis aux m\u00eames normes que les op\u00e9rateurs institutionnels, Starlink <a href=\"https:\/\/spacenews.com\/fcc-oks-lower-orbit-for-some-starlink-satellites\/\">a choisi<\/a> d\u2019en placer les trois quarts \u00e0 moins de 600 kilom\u00e8tres, altitude sous laquelle les frictions sur l\u2019atmosph\u00e8re r\u00e9siduelle finissent par faire retomber un satellite sur Terre, m\u00eame en cas de panne du propulseur pr\u00e9vu \u00e0 cet effet. N\u00e9anmoins, il \u00e9tait pr\u00e9vu qu\u2019une partie de la constellation d\u2019Elon Musk orbite au-del\u00e0 de 1 000 kilom\u00e8tres d\u2019altitude o\u00f9 la redescente naturelle n\u2019est plus possible : un satellite en panne dans cette r\u00e9gion y reste durant des si\u00e8cles. Le 17 avril 2020, SpaceX <a href=\"https:\/\/spaceflightnow.com\/2020\/04\/21\/spacex-modifies-starlink-network-design-as-another-60-satellites-gear-up-for-launch\/\">a modifi\u00e9 ses plans<\/a> en demandant l\u2019autorisation que tous ses satellites orbitent \u00e0 moins de 600 kilom\u00e8tres d\u2019altitude. Le risque est grand d\u2019encombrer d\u00e9finitivement les orbites basses, aussi convoit\u00e9es par d\u2019autres op\u00e9rateurs.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium\" src=\"https:\/\/www.pressenza.com\/wp-content\/uploads\/2020\/05\/Starlink-Satellite.jpg\" width=\"799\" height=\"533\" \/><\/p>\n<figure class=\"align-center \"><figcaption><span class=\"caption\">Une photo prise avec 5 secondes d\u2019ouverture montre les tra\u00een\u00e9es laiss\u00e9es par les 9 premiers satellites d\u2019un \u00ab train \u00bb Starlink, vu au Royaume-Uni.<\/span><br \/>\n<span class=\"attribution\"><a class=\"source\" href=\"https:\/\/www.flickr.com\/photos\/ronancantwell\/49306080187\/\">Ronan\/Flickr<\/a>, <a class=\"license\" href=\"http:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0\/\">CC BY-NC-SA<\/a><\/span><\/figcaption><\/figure>\n<p>Tout aussi catastrophique est la mise en place d\u2019infrastructures d\u00e9mesur\u00e9es, impliquant une pr\u00e9dation des ressources en \u00e9nergie et en mati\u00e8re de notre plan\u00e8te, tant pour construire les satellites que pour les lancer, les piloter ou les utiliser. Contrairement aux satellites g\u00e9ostationnaires habituellement utilis\u00e9s dans les t\u00e9l\u00e9communications, les satellites Starlink orbitent \u00e0 basse altitude. Ils traversent le ciel visible d\u2019un lieu donn\u00e9 en seulement quelques minutes. Pour les suivre, chaque utilisateur devra acheter une antenne sp\u00e9ciale (dite <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Antenne_r%C3%A9seau_%C3%A0_commande_de_phase\">\u00e0 commande de phase<\/a>). Ces antennes au sol devront \u00eatre fabriqu\u00e9es en masse pour rendre leur prix abordable. SpaceX a d\u00e9j\u00e0 demand\u00e9 l\u2019autorisation <a href=\"https:\/\/fcc.report\/IBFS\/SES-LIC-INTR2019-00217\">d\u2019en installer un million<\/a>\u2026 pour commencer. En outre, SpaceX pr\u00e9voit d\u2019installer des raccords entre son r\u00e9seau Starlink et les principaux points d\u2019interconnexion du r\u00e9seau Internet.<\/p>\n<p><strong>Des flottes de satellites priv\u00e9es et en concurrence<\/strong><\/p>\n<p>Pire encore, la concurrence aff\u00fbte ses armes : les am\u00e9ricains <a href=\"https:\/\/spacenews.com\/amazon-lays-out-constellation-service-goals-deployment-and-deorbit-plans-to-fcc\/\">Kuiper<\/a> promu par Amazon, et <a href=\"https:\/\/fr.wikipedia.org\/wiki\/OneWeb\">OneWeb<\/a> du milliardaire Greg Wyler, ou le chinois <a href=\"http:\/\/www.satnews.com\/story.php?number=257303683\">Hongyan<\/a>. Comme pour les trottinettes \u00e9lectriques, plusieurs industriels se lancent dans une production massive, d\u00e9sastreuse du point de vue \u00e9cologique comme <a href=\"https:\/\/www.air-cosmos.com\/article\/oneweb-en-cessation-de-paiement-22849\">\u00e9conomique<\/a>. Le but est d\u2019\u00eatre le premier \u00e0 occuper le terrain pour emporter la partie, notamment pour <a href=\"https:\/\/applemagazine.com\/how-5g-and-starlink-will-change-iot-in-2020-and-beyond\/41211\">capter le march\u00e9 des objets connect\u00e9s<\/a>. Elon Musk a forc\u00e9 l\u2019allure pour avoir un coup d\u2019avance mais il n\u2019est pas le seul, et plusieurs syst\u00e8mes redondants pourraient bient\u00f4t tourner au-dessus de nos t\u00eates ! Il y aura tout au plus un gagnant\u2026 et peut-\u00eatre m\u00eame aucun.<\/p>\n<p>Le 9 mars 2020, Elon Musk a annonc\u00e9 que gr\u00e2ce \u00e0 Starlink, <a href=\"https:\/\/www.youtube.com\/watch?v=HPV8Xp3pEpI\">\u00ab les clients pourront regarder des films en haute d\u00e9finition, jouer \u00e0 des jeux vid\u00e9o et faire tout ce qu\u2019ils veulent \u00bb<\/a>. Affichant explicitement sa volont\u00e9 de renforcer des activit\u00e9s num\u00e9riques <a href=\"https:\/\/theshiftproject.org\/article\/pour-une-sobriete-numerique-rapport-shift\/\">d\u00e9j\u00e0 massivement polluantes<\/a> (vid\u00e9o en streaming, visioconf\u00e9rences, jeux vid\u00e9o en ligne), la phrase d\u2019Elon Musk se termine d\u2019une fa\u00e7on significative : mes clients pourront faire tout ce qu\u2019ils veulent, comme moi je fais ce que je veux. Elon Musk semble \u00eatre en train de s\u2019approprier l\u2019espace avec l\u2019autorisation de la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Commission_f%C3%A9d%C3%A9rale_des_communications\">Federal Communications Commission<\/a>, l\u2019agence charg\u00e9e de r\u00e9guler les t\u00e9l\u00e9communications et les r\u00e9seaux aux \u00c9tats-Unis et qui <a href=\"https:\/\/www.lemonde.fr\/pixels\/article\/2018\/06\/11\/aux-etats-unis-la-neutralite-du-net-prend-officiellement-fin_5312968_4408996.html\">d\u00e9cida d\u2019y abroger les r\u00e8gles de neutralit\u00e9 d\u2019Internet<\/a>. La division espace de la FCC <a href=\"https:\/\/www.fcc.gov\/general\/international-bureau-satellite-division\">indique<\/a> ses priorit\u00e9s : autoriser plus de satellites, plus vite, avec moins de r\u00e9glementation.<\/p>\n<p>Ainsi, l\u2019autorit\u00e9 am\u00e9ricaine charg\u00e9e de r\u00e9guler les communications de son pays autorise une entreprise \u00e0 r\u00e9aliser ce qui ressemble \u00e0 une privatisation de l\u2019espace en occupant massivement les orbites basses tout en accaparant des ressources utiles \u00e0 toute la plan\u00e8te \u2013 alors m\u00eame que l\u2019espace a \u00e9t\u00e9 d\u00e9clar\u00e9 bien commun de l\u2019humanit\u00e9 par le <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Droit_de_l%C2%A0%27espace\">trait\u00e9 de l\u2019espace de 1967<\/a>.<\/p>\n<hr \/>\n<p><em>Cet article a b\u00e9n\u00e9fici\u00e9 de discussions avec Emmanuelle Rio (chercheure au Laboratoire de Physique des Solides, Universit\u00e9 Paris-Saclay), Jean\u2011Manuel Traimond (auteur et conf\u00e9rencier) et Aur\u00e9lien Ficot (ing\u00e9nieur en sciences environnementales et formateur).<\/em><\/p>\n<p><a href=\"https:\/\/theconversation.com\/profiles\/roland-lehoucq-873450\">Roland Lehoucq<\/a>, Chercheur en astrophysique, <em><a href=\"https:\/\/theconversation.com\/institutions\/commissariat-a-lenergie-atomique-et-aux-energies-alternatives-cea-2395\">Commissariat \u00e0 l\u2019\u00e9nergie atomique et aux \u00e9nergies alternatives (CEA)<\/a><\/em> et <a href=\"https:\/\/theconversation.com\/profiles\/francois-graner-1062071\">Fran\u00e7ois Graner<\/a>, Directeur de recherches, <em><a href=\"https:\/\/theconversation.com\/institutions\/universite-de-paris-4263\">Universit\u00e9 de Paris<\/a><\/em><\/p>\n<p>Cet article est republi\u00e9 \u00e0 partir de <a href=\"https:\/\/theconversation.com\">The Conversation<\/a> sous licence Creative Commons. Lire l\u2019<a href=\"https:\/\/theconversation.com\/starlink-les-dommages-collateraux-de-la-flotte-de-satellites-delon-musk-135330\">article original<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Roland Lehoucq, Commissariat \u00e0 l\u2019\u00e9nergie atomique et aux \u00e9nergies alternatives (CEA) et Fran\u00e7ois Graner, Universit\u00e9 de Paris Au-dessus de nos t\u00eates est en train de se jouer une partie d\u2019\u00e9checs invisible mais dont les cons\u00e9quences sont immenses. Les 18 mars&hellip;<\/p>\n","protected":false},"author":1791,"featured_media":1105994,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[98,40,495],"tags":[74480,75481,75482],"class_list":["post-1105990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-droits-de-lhomme","category-international-fr","category-sciences-technologie","tag-elon-musk-fr","tag-flotte-de-satellites","tag-starlink-fr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Starlink : les dommages collat\u00e9raux de la flotte de satellites d\u2019Elon Musk<\/title>\n<meta name=\"description\" content=\"Roland Lehoucq, Commissariat \u00e0 l\u2019\u00e9nergie atomique et aux \u00e9nergies alternatives (CEA) et Fran\u00e7ois Graner, Universit\u00e9 de Paris Au-dessus de nos t\u00eates est en\" 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