{"id":15619,"date":"2022-11-30T11:42:07","date_gmt":"2022-11-30T10:42:07","guid":{"rendered":"https:\/\/agora.xtec.cat\/inslacetania\/?p=15619"},"modified":"2022-11-30T11:42:07","modified_gmt":"2022-11-30T10:42:07","slug":"la-via-lactia","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/inslacetania\/general\/la-via-lactia\/","title":{"rendered":"LA VIA L\u00c0CTIA"},"content":{"rendered":"

La Via L\u00e0ctia \u00e9s la nostra mare. Aquest nom se li va donar dagut a la perspactiva que tenim des del planeta terra, mirant el firmament intens, obscur, i infinit; una faixa de feble lluminositat al cel nocturn constitu\u00efda per estrelles que no es poden veure individualment a ull nu. I ve del nom llat\u00ed via lactea<\/i>, que al seu torn deriva del nom\u00a0grec\u00a0\u03b3\u03b1\u03bb\u03b1\u03be\u03af\u03b1\u03c2 \u03ba\u03cd\u03ba\u03bb\u03bf\u03c2 (galaxias kiklos<\/i>), amb el significat de ‘cercle lacti.’<\/p>\n

\"\"<\/a><\/p>\n

Una esp\u00e8cie de boirina amb multituds de colors dispersa en l’ampli firmament profund, una llum encegadora, ferotge, \u00e0mplia, sorgint d’entre les tenebres d’un cel obscur amb pinzellades de brillantor fins on t’arriba la vista, aglomeracions d’estrelles pures i joves i algunes velles esmiculades pel pas del temps, una forma d’espiral lligada a les seves arrels, lligades al punt 0 de la gal\u00e0xia on un forat negre espera pacientment la seva hora.<\/p>\n

\"\"<\/a><\/p>\n

El centre g\u00e0lactic de la Via L\u00e0ctia vist desde la terra.<\/strong><\/p>\n

Est\u00e0 formada per m\u00e9s de 200.000 milions d’estels (alguns estudis recents n’hi atribueixen fins a 400.000 milions). Al centre de la Via L\u00e0ctia hi ha un forat negre supermassiu que \u00e9s molt dif\u00edcil de detectar en l’espectre electromagn\u00e8tic a causa de la gran densitat d’estels que hi ha a la part central d’una gal\u00e0xia, per\u00f2 que es fa evident amb estudis gravim\u00e8trics.<\/p>\n

\"\"<\/a><\/p>\n

Podeu apreciar el forat negre fotografiat, el qual gira al voltant de la constel.laci\u00f3 de Canes Venatici.<\/strong><\/p>\n

Totes les estrelles que veiem al cel en l’espectre visible sense ajut de telescopis formen part de la nostra gal\u00e0xia, i s\u00f3n les que constitueixen les agrupacions anomenades constel\u00b7lacions. Una important excepci\u00f3 \u00e9s la gal\u00e0xia d’Andr\u00f2meda, visible a ull nu des de l’hemisferi nord, aix\u00ed com les gal\u00e0xies conegudes com a N\u00favols de Magallanes (petit i gran), visibles des de l’hemisferi sud.<\/p>\n

\"\"<\/a><\/p>\n

Nuvols de Magallanes.<\/strong><\/p>\n

LES SEVES MAGNITUDS<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n
Caracter\u00edstiques f\u00edsiques i astrom\u00e8triques<\/th>\n<\/tr>\n
Radi<\/th>\n50.000 a.l.\u00a0\"Modifica<\/a><\/span><\/td>\n<\/tr>\n
Di\u00e0metre<\/th>\n100.000 a.l.\u00a0\"Modifica<\/a><\/span><\/td>\n<\/tr>\n
Magnitud absoluta<\/th>\n\u221220,9\u00a0\"Modifica<\/a><\/span><\/td>\n<\/tr>\n
Massa<\/th>\n1.200.000.000.000 M\u2609\u00a0\"Modifica<\/a><\/span><\/td>\n<\/tr>\n
Periode de rotaci\u00f3<\/th>\n87.000.000.000 d\u00a0\"Modifica<\/a><\/span><\/td>\n<\/tr>\n
Part de<\/th>\nSubgrup de la Via L\u00e0ctia\u00a0i\u00a0Grup Local\u00a0\"Modifica<\/a><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

El disc estel\u00b7lar de la Via L\u00e0ctia mesura aproximadament 100.000\u00a0anys llum\u00a0(9,5\u00d71017<\/sup>\u00a0km) de di\u00e0metre, i es creu que de mitjana t\u00e9 un gruix d’uns 1.000\u00a0anys llum (9,5\u00d71015<\/sup> km). S’estima que cont\u00e9 un m\u00ednim de dos-cents mil milions d’estrelles i possiblement fins a quatre-cents mil milions, i el nombre exacte dep\u00e8n del nombre d’estrelles de massa molt petita, que \u00e9s molt incert. Estenent-se m\u00e9s enll\u00e0 del disc estel\u00b7lar, hi ha un disc molt m\u00e9s gruixut de gas. Observacions recents indiquen que el disc gas\u00f3s de la Via L\u00e0ctia t\u00e9 un gruix al voltant de 12.000 anys llum (1,1\u00d71017<\/sup>\u00a0km, el doble que el valor pr\u00e8viament acceptat).<\/sup>\u00a0Com a guia a escala f\u00edsica de la Via L\u00e0ctia, si aquesta es redu\u00eds fins a un di\u00e0metre de 100\u00a0metres, el sistema solar, incloent-hi el\u00a0N\u00favol d’Oort, no mesuraria m\u00e9s d’un mil\u00b7l\u00edmetre.<\/p>\n

\"\"<\/a><\/p>\n

Tamany de la Via L\u00e0ctia.<\/strong><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

La Via L\u00e0ctia \u00e9s la nostra mare. Aquest nom se li va donar dagut a la perspactiva que tenim des del planeta terra, mirant el firmament intens, obscur, i infinit; una faixa de feble lluminositat al cel nocturn constitu\u00efda per estrelles que no es poden veure individualment a ull nu. I ve del nom llat\u00ed […]<\/p>\n","protected":false},"author":1019,"featured_media":15976,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,102],"tags":[],"class_list":["post-15619","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-revista"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/posts\/15619","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/users\/1019"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/comments?post=15619"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/posts\/15619\/revisions"}],"predecessor-version":[{"id":15979,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/posts\/15619\/revisions\/15979"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/media\/15976"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/media?parent=15619"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/categories?post=15619"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/inslacetania\/wp-json\/wp\/v2\/tags?post=15619"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}