{"id":460,"date":"2025-06-05T09:25:11","date_gmt":"2025-06-05T09:25:11","guid":{"rendered":"https:\/\/www.google-sky.es\/blog\/?p=460"},"modified":"2026-03-09T18:08:54","modified_gmt":"2026-03-09T17:08:54","slug":"por-que-pluton-ya-no-es-un-planeta","status":"publish","type":"post","link":"https:\/\/www.google-sky.es\/blog\/por-que-pluton-ya-no-es-un-planeta\/","title":{"rendered":"\u00bfPor qu\u00e9 Plut\u00f3n ya no es un planeta? Explicaci\u00f3n sencilla"},"content":{"rendered":"\n<p>Durante d\u00e9cadas, Plut\u00f3n fue conocido como el noveno planeta del Sistema Solar. Su peque\u00f1o tama\u00f1o y \u00f3rbita lejana no le impidieron conquistar la imaginaci\u00f3n de cient\u00edficos, estudiantes y entusiastas del espacio. Sin embargo, en 2006, una decisi\u00f3n de la comunidad astron\u00f3mica cambi\u00f3 para siempre su estatus. Pero, \u00bfpor qu\u00e9 Plut\u00f3n ya no es un planeta?<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83e\ude90 <strong>\u00bfPor qu\u00e9 Plut\u00f3n ya no es un planeta? Un vistazo a su historia<\/strong><\/h2>\n\n\n\n<p>Plut\u00f3n fue descubierto en 1930 por el astr\u00f3nomo Clyde Tombaugh en el Observatorio Lowell, en Arizona, EE.\u202fUU. Su hallazgo fue celebrado como el descubrimiento de un nuevo planeta, el noveno del Sistema Solar. Aunque era m\u00e1s peque\u00f1o que cualquier otro planeta, nadie dudaba entonces de su estatus.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\uded1 <strong>\u00bfPor qu\u00e9 Plut\u00f3n dej\u00f3 de ser planeta en 2006? La decisi\u00f3n de la IAU<\/strong><\/h2>\n\n\n\n<p>El 24 de agosto de 2006, la <strong>Uni\u00f3n Astron\u00f3mica Internacional (IAU)<\/strong> decidi\u00f3 redefinir lo que se considera un planeta. \u00bfPor qu\u00e9? El avance de la tecnolog\u00eda hab\u00eda permitido descubrir otros cuerpos en el Cintur\u00f3n de Kuiper, similares o incluso m\u00e1s grandes que Plut\u00f3n, como <strong>Eris<\/strong>. Esto oblig\u00f3 a los cient\u00edficos a aclarar los criterios.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udccb <strong>Criterios para ser planeta y por qu\u00e9 Plut\u00f3n no los cumple<\/strong><\/h2>\n\n\n\n<p>Seg\u00fan la nueva definici\u00f3n de la IAU, para que un cuerpo sea considerado un planeta, debe cumplir <strong>tres condiciones<\/strong>:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Orbitar alrededor del <a href=\"https:\/\/www.google-sky.es\/blog\/index.php\/2025\/04\/08\/el-sol\/\" target=\"_blank\" rel=\"noreferrer noopener\">Sol<\/a>.<\/strong><\/li>\n\n\n\n<li><strong>Tener suficiente masa para que su gravedad le d\u00e9 forma esf\u00e9rica.<\/strong><\/li>\n\n\n\n<li><strong>Haber limpiado su \u00f3rbita de otros objetos.<\/strong><\/li>\n<\/ol>\n\n\n\n<p>Plut\u00f3n cumple los dos primeros puntos, pero <strong>no ha despejado su \u00f3rbita<\/strong>: comparte su espacio con otros objetos del Cintur\u00f3n de Kuiper.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\ud83d\udef0\ufe0f <strong>\u00bfQu\u00e9 es Plut\u00f3n ahora?<\/strong><\/h2>\n\n\n\n<p>A partir de 2006, Plut\u00f3n fue reclasificado como <strong>planeta enano<\/strong>. Esta categor\u00eda incluye cuerpos que:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Orbitan alrededor del Sol.<\/li>\n\n\n\n<li>Tienen forma esf\u00e9rica.<\/li>\n\n\n\n<li><strong>No han despejado su \u00f3rbita.<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Otros ejemplos de planetas enanos son <strong>Eris<\/strong>, <strong>Ceres<\/strong>, <strong>Haumea<\/strong> y <strong>Makemake<\/strong>. Aunque Plut\u00f3n ya no sea un planeta \u201coficial\u201d, sigue siendo uno de los objetos m\u00e1s fascinantes del sistema solar.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u2696\ufe0f <strong>\u00bfSigue la pol\u00e9mica sobre por qu\u00e9 Plut\u00f3n ya no es un planeta?<\/strong><\/h2>\n\n\n\n<p>La decisi\u00f3n de degradar a Plut\u00f3n no fue bien recibida por todos. Muchos astr\u00f3nomos, incluido Alan Stern, l\u00edder de la misi\u00f3n New Horizons de la NASA (que visit\u00f3 Plut\u00f3n en 2015), han criticado la definici\u00f3n. Argumentan que el criterio de \u00ablimpiar su \u00f3rbita\u00bb es poco pr\u00e1ctico y excluye incluso planetas como J\u00fapiter si se aplica de forma estricta.<\/p>\n\n\n\n<p>Algunos cient\u00edficos proponen volver a incluir a Plut\u00f3n como planeta, o ampliar la definici\u00f3n para aceptar a decenas de otros cuerpos.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusi\u00f3n: Plut\u00f3n sigue siendo especial<\/h2>\n\n\n\n<p>Aunque <strong>Plut\u00f3n ya no es un planeta seg\u00fan la definici\u00f3n oficial<\/strong>, su importancia cient\u00edfica y su valor simb\u00f3lico siguen intactos. Ha sido el protagonista de importantes descubrimientos sobre el Sistema Solar exterior y contin\u00faa inspirando la curiosidad humana.<\/p>\n\n\n\n<p>La ciencia evoluciona constantemente, y Plut\u00f3n es un excelente ejemplo de c\u00f3mo nuestras ideas pueden cambiar a medida que aprendemos m\u00e1s sobre el universo.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u00daltimas publicaciones<\/h2>\n\n\n<ul class=\"wp-block-latest-posts__list has-dates wp-block-latest-posts\"><li><div class=\"wp-block-latest-posts__featured-image alignleft\"><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.google-sky.es\/blog\/wp-content\/uploads\/2026\/02\/Margaret_Hamilton-150x150.gif\" class=\"attachment-thumbnail size-thumbnail wp-post-image\" alt=\"Margaret Hamilton junto al c\u00f3digo de programaci\u00f3n del Apolo 11\" style=\"max-width:75px;max-height:75px;\" \/><\/div><a 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Su peque\u00f1o tama\u00f1o y \u00f3rbita lejana no le impidieron conquistar la imaginaci\u00f3n de&hellip;<\/p>\n","protected":false},"author":1,"featured_media":462,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","footnotes":""},"categories":[19],"tags":[205],"class_list":["post-460","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomia-cosmos","tag-curiosidades"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfPor qu\u00e9 Plut\u00f3n ya no es un planeta? Explicaci\u00f3n sencilla - Google Sky<\/title>\n<meta name=\"description\" content=\"\u00bfPor qu\u00e9 Plut\u00f3n ya no es un planeta? 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