Les fus\u00e9es SpaceX cr\u00e9ent des trous lumineux dans le ciel et c'est un probl\u00e8me<\/title>\n<meta name=\"description\" content=\"La multiplication des lancements de fus\u00e9es entra\u00eene celle d'un ph\u00e9nom\u00e8ne visible \u00e0 l\u2019\u0153il nu. 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Une boule de lumi\u00e8re cr\u00e9\u00e9e par une fus\u00e9e SpaceX \/ Cr\u00e9dits : Stephen Hummel \/ McDonald Observatory<\/figcaption><\/figure>\n

Apr\u00e8s un feuilleton qui a tenu en haleine les passionn\u00e9s de conqu\u00eate spatiale pendant des mois, la fus\u00e9e Starship de SpaceX a enfin d\u00e9coll\u00e9 le 18 novembre<\/a> dernier. Il s'agissait de son deuxi\u00e8me vol d'essai, et c'est un finalement succ\u00e8s en demi-teinte pour l'agence spatiale d'Elon Musk<\/strong>. Ce n'est pas tant le lancement en lui-m\u00eame qui a retenu l'attention de certains astronomes, mais ses effets sur notre atmosph\u00e8re. Un ph\u00e9nom\u00e8ne bien connu commence en effet \u00e0 prendre de l'ampleur avec la multiplication des lancements sign\u00e9s SpaceX. Il faut dire que l'agence s'occupe m\u00eame des satellites europ\u00e9ens<\/a>.<\/p>\n

Baptis\u00e9 “aurore SpaceX”, il s'agit de la formation d'une grosse boule de lumi\u00e8re rouge dans le ciel<\/strong>. Dans le cas de la soci\u00e9t\u00e9 am\u00e9ricaine, elle est caus\u00e9e par la combustion du second \u00e9tage de la fus\u00e9e tandis qu'il retombe vers la Terre<\/strong>. La “t\u00e2che” qui en r\u00e9sulte est visible \u00e0 l\u2019\u0153il nu<\/strong> et persiste pendant quelques secondes. En r\u00e9alit\u00e9, c'est un trou dans la ionosph\u00e8re<\/strong>, une couche de l'atmosph\u00e8re terrestre situ\u00e9e entre 60 et 1000 km du sol. Stephen Hummel, astronome \u00e0 l'observatoire McDonald au Texas, explique qu'il en voit 2 \u00e0 5 par mois<\/strong>.<\/p>\n