{"id":17196,"date":"2026-05-04T15:20:17","date_gmt":"2026-05-04T18:20:17","guid":{"rendered":"https:\/\/impactocastex.com.ar\/?p=17196"},"modified":"2026-05-04T15:20:17","modified_gmt":"2026-05-04T18:20:17","slug":"descubren-a-loki-un-sistema-estelar-antiguo-y-caotico-oculto-en-la-via-lactea","status":"publish","type":"post","link":"https:\/\/impactocastex.com.ar\/?p=17196","title":{"rendered":"Descubren a Loki, un sistema estelar antiguo y ca\u00f3tico oculto en la V\u00eda L\u00e1ctea"},"content":{"rendered":"<p>Un equipo internacional de astr\u00f3nomos, liderado por Federico Sestito, revel\u00f3 el descubrimiento de lo que denominan <b>Loki<\/b>, un sistema estelar ancestral que <b>se encuentra oculto a plena vista dentro de la V\u00eda L\u00e1ctea<\/b>. Seg\u00fan el art\u00edculo publicado en <a href=\"https:\/\/academic.oup.com\/mnras\/article\/548\/2\/stag563\/8537783?login=false\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/academic.oup.com\/mnras\/article\/548\/2\/stag563\/8537783?login=false\"><i>Monthly Notices of the Royal Astronomical Society<\/i><\/a>, este hallazgo representa el posible vestigio de <b>una galaxia masiva que colision\u00f3 con la nuestra<\/b> durante las primeras etapas de su formaci\u00f3n, por lo que dej\u00f3 un rastro de estrellas con <b>\u00f3rbitas peculiares<\/b> y una composici\u00f3n qu\u00edmica <b>inusualmente homog\u00e9nea<\/b>.<\/p>\n<p>Los investigadores analizaron <b>20 estrellas extremadamente antiguas<\/b>, identificadas como de muy baja metalicidad, <a href=\"https:\/\/www.lanacion.com.ar\/lifestyle\/en-las-redes\/descubrimientos-recientes-sugieren-la-existencia-de-un-planeta-oculto-en-nuestro-sistema-solar-nid07112024\/\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/www.lanacion.com.ar\/lifestyle\/en-las-redes\/descubrimientos-recientes-sugieren-la-existencia-de-un-planeta-oculto-en-nuestro-sistema-solar-nid07112024\/\">localizadas en el vecindario solar<\/a>. Lo que llam\u00f3 la atenci\u00f3n del equipo cient\u00edfico fue su comportamiento din\u00e1mico: a diferencia de las estrellas dispersas en el halo gal\u00e1ctico, estos cuerpos celestes <b>mantienen \u00f3rbitas que rozan el plano de la V\u00eda L\u00e1ctea<\/b> con excentricidades elevadas, que oscilan entre 0,5 y 0,9. De este conjunto, 11 estrellas siguen <b>\u00f3rbitas progradas<\/b>, es decir que rotan en la misma direcci\u00f3n que la galaxia, mientras que nueve se mueven en <b>sentido retr\u00f3grado<\/b>. La hip\u00f3tesis de los expertos es que esta configuraci\u00f3n fue provocada por una colisi\u00f3n violenta hace <b>m\u00e1s de 10.000 millones de a\u00f1os<\/b>, evento que <a href=\"https:\/\/www.lanacion.com.ar\/ciencia\/hallazgo-interestelar-que-hay-de-similar-entre-los-dos-unicos-cometas-extrasolares-que-pasaron-por-nid05112025\/\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/www.lanacion.com.ar\/ciencia\/hallazgo-interestelar-que-hay-de-similar-entre-los-dos-unicos-cometas-extrasolares-que-pasaron-por-nid05112025\/\">dispers\u00f3 las estrellas del sistema<\/a> entrante en una estructura de formaci\u00f3n ca\u00f3tica.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/resizer.glanacion.com\/resizer\/v2\/RRLQHLPCW5BFRCHIWUNK4JAFOQ.jpg?auth=1bc81070dd88f71ba9b052f9f263fa8864fbb82352164ff73658bf7743a4bbd9&amp;smart=true&amp;width=8640&amp;height=5760\" alt=\"La V\u00eda L\u00e1ctea todav\u00eda esconde muchos secretos por descubrir para la humanidad\" height=\"5760\" width=\"8640\" \/><\/p>\n<p>Estos resultados indican que estas estrellas quiz\u00e1 sean <b>los restos de un antiguo sistema que colision\u00f3 con nuestra galaxia<\/b>. Al analizar los espectros, los cient\u00edficos hallaron que las abundancias qu\u00edmicas de estos objetos son <b>significativamente m\u00e1s estrechas<\/b> que las observadas en el halo o en el bulbo de la V\u00eda L\u00e1ctea. Esta cohesi\u00f3n qu\u00edmica sugiere que las estrellas <b>se formaron en un entorno cerrado y coherente<\/b>, similar a lo que ocurre en <a href=\"https:\/\/www.lanacion.com.ar\/ciencia\/astronomia-las-primeras-galaxias-eran-mas-masivas-de-lo-que-se-pensaba-nid01022021\/\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/www.lanacion.com.ar\/ciencia\/astronomia-las-primeras-galaxias-eran-mas-masivas-de-lo-que-se-pensaba-nid01022021\/\">una galaxia enana cl\u00e1sica<\/a> antes de ser absorbida.<\/p>\n<p>Para confirmar esta teor\u00eda, el equipo emple\u00f3 simulaciones cosmol\u00f3gicas de alta resoluci\u00f3n denominadas NIHAO-UHD. Estas simulaciones demuestran que es f\u00edsicamente posible que <b>un \u00fanico sistema que impacta con una proto-galaxia poco densa<\/b> pueda dispersar sus estrellas tanto en configuraciones programadas como retr\u00f3gradas. En la mitolog\u00eda n\u00f3rdica, <b>Loki es un dios conocido por generar caos<\/b>, un nombre que los investigadores <b>consideran apropiado<\/b> para este progenitor estelar. Seg\u00fan los modelos de evoluci\u00f3n qu\u00edmica, este sistema tendr\u00eda una masa total de materia bari\u00f3nica cercana a <b>los 1400 millones de masas solares<\/b>, una magnitud comparable a la de <a href=\"https:\/\/www.lanacion.com.ar\/tecnologia\/asi-se-ve-gran-nube-magallanes-retratada-nid2248103\/\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/www.lanacion.com.ar\/tecnologia\/asi-se-ve-gran-nube-magallanes-retratada-nid2248103\/\">las Nubes de Magallanes<\/a>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/resizer.glanacion.com\/resizer\/v2\/O3VAWL7HZFG6LDWCENYNNSUQFY.JPG?auth=68cd5f1b021c7f6c7ba5fcc09aefcc1a7fee6a848d5bc57eaacd501d6a3ee729&amp;smart=true&amp;width=2000&amp;height=1332\" alt=\"El nombre Loki se relaciona r\u00e1pidamente con la figura mitol\u00f3gica n\u00f3rdica y con el personaje de Marvel interpretado por Tom Hiddleston\" height=\"1332\" width=\"2000\" \/><\/p>\n<p>Aunque <b>el descubrimiento de Loki<\/b> desaf\u00eda las visiones tradicionales sobre la estructura del halo gal\u00e1ctico, los autores advierten que el <a href=\"https:\/\/www.lanacion.com.ar\/ciencia\/la-via-lactea-estaria-inmersa-en-una-gigantesca-lamina-de-materia-oscura-segun-un-nuevo-estudio-nid31012026\/\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/www.lanacion.com.ar\/ciencia\/la-via-lactea-estaria-inmersa-en-una-gigantesca-lamina-de-materia-oscura-segun-un-nuevo-estudio-nid31012026\/\">complejo proceso de formaci\u00f3n de la V\u00eda L\u00e1ctea<\/a> pudo involucrar m\u00faltiples eventos de acreci\u00f3n. \u201c<b>Es probable que m\u00faltiples eventos hayan contribuido a esta poblaci\u00f3n diversa<\/b>\u201d, advierten los investigadores en su publicaci\u00f3n acad\u00e9mica. El an\u00e1lisis comparativo mediante algoritmos como t-SNE permiti\u00f3 diferenciar a Loki de otras estructuras identificadas recientemente. La peculiaridad del grupo radica en su combinaci\u00f3n de<b> \u00f3rbitas exc\u00e9ntricas<\/b> y una <b>homogeneidad qu\u00edmica<\/b> que no se registr\u00f3 con tanta claridad en otras reliquias gal\u00e1cticas conocidas.<\/p>\n<p>Este hallazgo no solo <b>redefine la historia de ensamblaje de la V\u00eda L\u00e1ctea<\/b>, sino que tambi\u00e9n subraya la importancia de los pr\u00f3ximos sondeos espectrosc\u00f3picos como WEAVE y 4MOST, situados en el hemisferio sur. Estos nuevos instrumentos permitir\u00e1n <b>confirmar si Loki es una entidad singular o apenas la punta del iceberg<\/b> de un pasado gal\u00e1ctico mucho m\u00e1s turbulento y fragmentado de lo que se cre\u00eda originalmente. Mientras tanto, estas 20 estrellas persisten como silenciosos testigos de una \u00e9poca remota en la que nuestra galaxia a\u00fan no era m\u00e1s que <b>un hervidero de colisiones y fusiones c\u00f3smicas<\/b>, a la espera de que <a href=\"https:\/\/www.lanacion.com.ar\/el-mundo\/america-latina-en-la-carrera-espacial-entre-las-oportunidades-y-el-desafio-de-no-llegar-tarde-a-la-nid25042026\/\" target=\"_blank\" rel=\"noreferrer\" title=\"https:\/\/www.lanacion.com.ar\/el-mundo\/america-latina-en-la-carrera-espacial-entre-las-oportunidades-y-el-desafio-de-no-llegar-tarde-a-la-nid25042026\/\">la tecnolog\u00eda moderna<\/a> permitiera decodificar su origen oculto en <b>las profundidades del plano gal\u00e1ctico<\/b>.<\/p>\n<p>\u200bUn grupo de astr\u00f3nomos logro identificar los restos de una masiva galaxia enana que colision\u00f3 con nuestra galaxia hace m\u00e1s de 10.000 millones de a\u00f1os; este hallazgo arroja nueva luz sobre el violento origen de nuestro vecindario c\u00f3smico\u00a0\u00a0<\/p>","protected":false},"excerpt":{"rendered":"<p>Un equipo internacional de astr\u00f3nomos, liderado por Federico Sestito, revel\u00f3 el descubrimiento de lo que&#8230;<\/p>\n","protected":false},"author":1,"featured_media":17197,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[89],"tags":[],"class_list":["post-17196","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nacionales"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Descubren a 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