{"id":819990,"date":"2019-03-10T03:10:50","date_gmt":"2019-03-10T03:10:50","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=819990"},"modified":"2019-03-10T03:10:50","modified_gmt":"2019-03-10T03:10:50","slug":"cuanto-pesa-la-via-lactea-los-astronomos-por-fin-lo-saben","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/es\/2019\/03\/cuanto-pesa-la-via-lactea-los-astronomos-por-fin-lo-saben\/","title":{"rendered":"\u00bfCu\u00e1nto pesa la V\u00eda L\u00e1ctea? Los astr\u00f3nomos por fin lo saben"},"content":{"rendered":"<p>Tras a\u00f1os de esfuerzos por estimar el tama\u00f1o de nuestra galaxia, astr\u00f3nomos de la NASA y de la Agencia Espacial Europea (ESA) han podido determinar que la V\u00eda L\u00e1ctea pesa alrededor de\u00a01,5 billones de masas solares\u00a0y tiene un radio de 129.000 a\u00f1os luz desde el centro gal\u00e1ctico.<\/p>\n<p>Las estimaciones anteriores oscilaban entre 500.000 millones y 3 billones de la masa del Sol, una diferencia que se deb\u00eda a la materia oscura, que compone aproximadamente el 90 % de la galaxia.<\/p>\n<p>\u00abSimplemente no podemos observar la materia oscura directamente\u00bb, explica en un\u00a0<a href=\"http:\/\/sci.esa.int\/hubble\/61198-hubble-and-gaia-accurately-weigh-the-milky-way-heic1905\/\" target=\"_blank\" rel=\"noopener noreferrer\">comunicado<\/a>\u00a0Laura Watkins, del Observatorio Europeo del Sur, en Alemania. \u00abEso es lo que lleva a la incertidumbre en cuanto a la masa de la V\u00eda L\u00e1ctea: no se puede medir con precisi\u00f3n lo que no se puede ver\u00bb, agrega la astr\u00f3noma, que dirigi\u00f3 el an\u00e1lisis del equipo.<\/p>\n<h3>\u00abUna gran combinaci\u00f3n de datos\u00bb<\/h3>\n<p>Es por eso que Watkins y sus colegas\u00a0recurrieron a otro m\u00e9todo, consistente en medir las velocidades de los llamados c\u00famulos globulares: densas acumulaciones de estrellas que orbitan el centro de la galaxia. Seg\u00fan explica N. Wyn Evans, de la Universidad de Cambridge, \u00abcuanto m\u00e1s masiva es una galaxia, m\u00e1s r\u00e1pido se mueven sus c\u00famulos bajo la fuerza de su gravedad\u00bb.<\/p>\n<p>Los astr\u00f3nomos utilizaron datos de la misi\u00f3n Gaia de la ESA para medir c\u00famulos globulares\u00a0en un radio de 65.000 a\u00f1os luz de la Tierra, y tambi\u00e9n datos del Hubble, de la NASA y la ESA, para medir c\u00famulos en un radio de hasta 130.000 a\u00f1os luz de la Tierra.<\/p>\n<p>\u00abTuvimos la suerte de obtener una gran combinaci\u00f3n de datos\u00bb, indic\u00f3 Roeland P. van der Marel, del Instituto de Ciencia de Telescopios Espaciales de EE.UU. Seg\u00fan este cient\u00edfico, al combinar las mediciones de la Gaia de 34 c\u00famulos globulares con las de 12 c\u00famulos m\u00e1s distantes del Hubble, el equipo pudo determinar la masa de la V\u00eda L\u00e1ctea \u00abde una manera que\u00a0ser\u00eda imposible sin estos dos telescopios espaciales\u00bb.<\/p>\n<p>Los investigadores estiman que al determinar con precisi\u00f3n la masa de la V\u00eda L\u00e1ctea obtendr\u00e1n \u00abuna comprensi\u00f3n m\u00e1s clara de d\u00f3nde se encuentra nuestra galaxia en un contexto cosmol\u00f3gico\u00bb.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tras a\u00f1os de esfuerzos por estimar el tama\u00f1o de nuestra galaxia, astr\u00f3nomos de la NASA y de la Agencia Espacial Europea (ESA) han podido determinar que la V\u00eda L\u00e1ctea pesa alrededor de\u00a01,5 billones de masas solares\u00a0y tiene un radio de&hellip;<\/p>\n","protected":false},"author":1181,"featured_media":819992,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[497,39],"tags":[48234,598,41609,51904,56127],"class_list":["post-819990","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciencia-tecnologia","category-internacional","tag-astronomia","tag-ciencia","tag-cosmos","tag-espacio","tag-via-lactea"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00bfCu\u00e1nto pesa la V\u00eda L\u00e1ctea? 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