{"id":70386,"date":"2025-10-28T14:44:41","date_gmt":"2025-10-28T14:44:41","guid":{"rendered":"https:\/\/www.entroncamentoonline.pt\/portal\/?p=70386"},"modified":"2025-10-28T09:49:15","modified_gmt":"2025-10-28T09:49:15","slug":"internacional-o-cometa-interestelar-3i-atlas-intriga-cientistas-objeto-pode-ter-mais-de-7-mil-milhoes-de-anos","status":"publish","type":"post","link":"https:\/\/www.entroncamentoonline.pt\/portal\/internacional-o-cometa-interestelar-3i-atlas-intriga-cientistas-objeto-pode-ter-mais-de-7-mil-milhoes-de-anos\/","title":{"rendered":"Internacional: O cometa interestelar 3I\/ATLAS intriga cientistas: objeto pode ter mais de 7 mil milh\u00f5es de anos"},"content":{"rendered":"<p><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">O cometa <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">3I\/ATLAS<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, identificado como o terceiro objeto de origem interestelar a atravessar o Sistema Solar, est\u00e1 a gerar grande preocupa\u00e7\u00e3o na comunidade cient\u00edfica internacional. Com uma <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">composi\u00e7\u00e3o qu\u00edmica in\u00e9dita<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> e uma <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">trajet\u00f3ria hiperb\u00f3lica imprevis\u00edvel.<\/span><\/span><\/p>\n<h3 class=\"western\"><strong><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Um visitante c\u00f3smico com comportamento fora do padr\u00e3o<\/span><\/span><\/strong><\/h3>\n<p><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Detectado em <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">1 de julho de 2025<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> pelo telesc\u00f3pio <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">ATLAS<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, no Chile, o 3I\/ATLAS apresenta uma <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">coma dominada por di\u00f3xido de carbono (CO\u2082)<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> \u2014 uma caracter\u00edstica nunca antes observada em cometas. Estudos do <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Telesc\u00f3pio Espacial James Webb (JWST)<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> revelaram que o cometa cont\u00e9m <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">oito vezes mais CO\u2082 do que \u00e1gua<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, ultrapassando em seis vezes os limites esperados para objetos semelhantes.<\/span><\/span><\/p>\n<p><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">A sua velocidade de desloca\u00e7\u00e3o, superior a <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">210 mil km\/h<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, e a emiss\u00e3o de \u00e1gua a dist\u00e2ncias superiores a <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">450 milh\u00f5es de km do Sol<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, refor\u00e7am a singularidade do fen\u00f3meno. O n\u00facleo s\u00f3lido do cometa est\u00e1 estimado entre <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">320 metros e 5,6 quil\u00f3metros de di\u00e2metro<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, e a sua origem extrassolar foi confirmada por modelos orbitais.<\/span><\/span><\/p>\n<h3 class=\"western\"><strong><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Exerc\u00edcio global de monitoriza\u00e7\u00e3o<\/span><\/span><\/strong><\/h3>\n<p><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Entre <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">27 de novembro de 2025 e 27 de janeiro de 2026<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, a <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Rede Internacional de Alerta de Asteroides (IAWN)<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> vai coordenar um <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">exerc\u00edcio global de observa\u00e7\u00e3o e medi\u00e7\u00e3o orbital<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, com o objetivo de melhorar a precis\u00e3o das previs\u00f5es e testar protocolos de resposta a amea\u00e7as espaciais. Embora n\u00e3o haja risco de colis\u00e3o com a Terra, o cometa representa <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">\u201cdesafios \u00fanicos\u201d<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> para os astr\u00f3nomos, devido \u00e0s varia\u00e7\u00f5es inesperadas no brilho e na trajet\u00f3ria.<\/span><\/span><\/p>\n<p><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">O <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">peri\u00e9lio<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\"> \u2014 ponto mais pr\u00f3ximo do Sol \u2014 ser\u00e1 atingido em <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">29 de outubro de 2025<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, momento cr\u00edtico para recolha de dados e an\u00e1lise da atividade do cometa.<\/span><\/span><\/p>\n<h3 class=\"western\"><strong><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">O cometa mais antigo j\u00e1 observado?<\/span><\/span><\/strong><\/h3>\n<p><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">Segundo os investigadores que lideram o estudo, o 3I\/ATLAS pode ser o <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">cometa mais antigo j\u00e1 observado<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, com uma idade estimada superior a <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">sete mil milh\u00f5es de anos<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">, ou seja, <\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">mais velho que o pr\u00f3prio Sistema Solar<\/span><\/span><span style=\"font-family: Arial, sans-serif;\"><span style=\"font-size: medium;\">. A sua passagem representa uma oportunidade \u00fanica para estudar materiais primordiais do universo e compreender melhor os processos de forma\u00e7\u00e3o planet\u00e1ria.<\/span><\/span><\/p>\n<div class=\"fb-background-color\">\n\t\t\t  <div \n\t\t\t  \tclass = \"fb-comments\" \n\t\t\t  \tdata-href = \"https:\/\/www.entroncamentoonline.pt\/portal\/internacional-o-cometa-interestelar-3i-atlas-intriga-cientistas-objeto-pode-ter-mais-de-7-mil-milhoes-de-anos\/\"\n\t\t\t  \tdata-numposts = \"10\"\n\t\t\t  \tdata-lazy = \"true\"\n\t\t\t\tdata-colorscheme = \"light\"\n\t\t\t\tdata-order-by = \"social\"\n\t\t\t\tdata-mobile=true>\n\t\t\t  <\/div><\/div>\n\t\t  <style>\n\t\t    .fb-background-color {\n\t\t\t\tbackground:  !important;\n\t\t\t}\n\t\t\t.fb_iframe_widget_fluid_desktop iframe {\n\t\t\t    width: 100% !important;\n\t\t\t}\n\t\t  <\/style>\n\t\t  ","protected":false},"excerpt":{"rendered":"<p>O cometa 3I\/ATLAS, identificado como o terceiro objeto de origem interestelar a atravessar o Sistema Solar, est\u00e1 a gerar grande preocupa\u00e7\u00e3o na comunidade cient\u00edfica internacional. Com uma composi\u00e7\u00e3o qu\u00edmica in\u00e9dita e uma trajet\u00f3ria hiperb\u00f3lica imprevis\u00edvel. Um visitante c\u00f3smico com comportamento fora do padr\u00e3o Detectado em 1 de julho de 2025 pelo telesc\u00f3pio ATLAS, no Chile, [&hellip;]<\/p>\n","protected":false},"author":43,"featured_media":70387,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[56,207,70],"tags":[],"class_list":["post-70386","post","type-post","status-publish","format-standard","has-post-thumbnail","category-1apagina","category-internacional","category-mais-noticias"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/posts\/70386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/users\/43"}],"replies":[{"embeddable":true,"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/comments?post=70386"}],"version-history":[{"count":0,"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/posts\/70386\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/media\/70387"}],"wp:attachment":[{"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/media?parent=70386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/categories?post=70386"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.entroncamentoonline.pt\/portal\/wp-json\/wp\/v2\/tags?post=70386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}