{"id":214,"date":"2020-11-28T21:06:20","date_gmt":"2020-11-28T19:06:20","guid":{"rendered":"http:\/\/www.cosmoespai.com\/cat\/?p=214"},"modified":"2020-11-28T21:06:20","modified_gmt":"2020-11-28T19:06:20","slug":"quantes-estrelles-hi-ha-a-la-via-lactia","status":"publish","type":"post","link":"https:\/\/www.cosmoespai.com\/cat\/quantes-estrelles-hi-ha-a-la-via-lactia\/","title":{"rendered":"Quantes estrelles hi ha a la Via L\u00e0ctia?"},"content":{"rendered":"\n<p class=\"has-text-align-justify\">La Via L\u00e0ctia \u00e9s la nostra gal\u00e0xia, on es troba el sistema solar, que est\u00e0 format per 8 planetes i les seves llunes. Tot i aix\u00ed, el sistema solar nom\u00e9s est\u00e0 format per una estrella, de petita mida, entre milers de milions d\u2019altres estrelles que hi ha a la Via L\u00e0ctia.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Tot i ser una gal\u00e0xia que t\u00e9 una forma semblant a la resta de gal\u00e0xies que hi ha en el nostre univers, \u00e9s m\u00e9s gran del normal. Per aquesta ra\u00f3, a la Via L\u00e0ctia hi ha m\u00e9s estrelles que en altres gal\u00e0xies. A la <strong><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/07\/01\/la-nostra-galaxia-la-via-lactia\/\" target=\"_blank\" rel=\"noreferrer noopener\">Via L\u00e0ctia<\/a><\/strong> es calcula que hi ha entre 200 mil milions i 400 mil milions d\u2019estrelles. La majoria d\u2019aquestes estrelles, com en qualsevol altra gal\u00e0xia, i en l\u2019univers, s\u00f3n d\u2019un tipus anomenat <strong><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/05\/07\/quins-tipus-destels-hi-ha\/\" target=\"_blank\" rel=\"noreferrer noopener\">nanes vermelles<\/a><\/strong>, que s\u00f3n el tipus d\u2019estrelles m\u00e9s petit que hi ha, i les que consumeixen m\u00e9s a poc a poc la seva energia, el que provoca que visquin durant m\u00e9s temps.<\/p>\n\n\n\n<p class=\"has-text-align-justify\">Encara que sembli que 200 mil milions d\u2019estrelles en una gal\u00e0xia tinguin que estar molt juntes, la veritat \u00e9s que entre cada estrella hi ha una dist\u00e0ncia enorme, ja que una gal\u00e0xia es pot estendre en una superf\u00edcie d\u2019uns 200 000 anys llum (1,83 x 10<sup>18 <\/sup>kil\u00f2metres de di\u00e0metre). Per exemple, l\u2019estrella m\u00e9s pr\u00f2xima a la Terra, a part del Sol, est\u00e0 a uns 5 anys llum de dist\u00e0ncia (el sistema estel\u00b7lar d\u2019Alfa Centauri).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong><em><span style=\"text-decoration: underline;\">Per qu\u00e8 no podem veure totes les estrelles?<\/span><\/em><\/strong><\/h4>\n\n\n\n<p class=\"has-text-align-justify\">Tot i aix\u00ed, nom\u00e9s podem veure una part de totes aquestes estrelles. Les raons per les quals no les podem veure totes s\u00f3n v\u00e0ries:<\/p>\n\n\n\n<ul><li>Hi ha estrelles que estan a l\u2019altra punta de la gal\u00e0xia, i que, per tant, estan molt lluny per a ser observades a simple vista.<\/li><\/ul>\n\n\n\n<ul><li>Tamb\u00e9 hi ha estrelles que s\u00f3n m\u00e9s brillants que d\u2019altres, i per tant eclipsen a les que brillen menys.<\/li><\/ul>\n\n\n\n<ul><li>Per \u00faltim, hi ha estrelles que no brillen gaire, i per tant quasi no ens arriba la seva llum.<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-justify\">Tot i aix\u00ed, gr\u00e0cies als nous telescopis, que cada cop s\u00f3n millors i m\u00e9s precisos, es poden observar moltes m\u00e9s estrelles, el que permet con\u00e8ixer un nombre m\u00e9s gran d\u2019estrelles a la nostra gal\u00e0xia, i tamb\u00e9 arribar a observar moltes m\u00e9s gal\u00e0xies que estan molt lluny de nosaltres.<\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p><strong>Entrades Similars:<\/strong><\/p>\n\n\n\n<p><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/07\/01\/la-nostra-galaxia-la-via-lactia\/\">La nostra gal\u00e0xia: la Via L\u00e0ctia<\/a><\/p>\n\n\n\n<p><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/05\/07\/quins-tipus-destels-hi-ha\/\">Quins tipus d\u2019estels hi ha?<\/a><\/p>\n\n\n\n<p><strong>Entrades Populars:<\/strong><\/p>\n\n\n\n<p><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/09\/09\/perque-la-lluna-nomes-ens-ensenya-una-cara\/\">Perqu\u00e8 la Lluna nom\u00e9s ens ensenya una cara?<\/a><\/p>\n\n\n\n<p><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/08\/26\/la-cara-fosca-de-la-lluna-que-es-el-que-shi-amaga\/\">La cara fosca de la Lluna. Qu\u00e8 \u00e9s el que s\u2019hi amaga?<\/a><\/p>\n\n\n\n<p><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/11\/06\/els-satellits-de-jupiter-una-gran-familia\/\">Els sat\u00e8l\u00b7lits de J\u00fapiter, una gran fam\u00edlia<\/a><\/p>\n\n\n\n<p><a href=\"http:\/\/www.cosmoespai.com\/cat\/2020\/10\/10\/quina-mida-i-forma-tindrien-els-extraterrestres\/\">Quina mida i forma tindrien els extraterrestres?<\/a><\/p>\n\n\n\n<p><strong>Entrades Recents:<\/strong><\/p>\n\n\n<ul class=\"wp-block-latest-posts__list is-grid columns-3 wp-block-latest-posts\"><li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.cosmoespai.com\/cat\/com-viatjar-al-futur-sense-violar-les-lleis-de-la-fisica\/\">Com Viatjar al Futur Sense Violar les Lleis de la F\u00edsica<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.cosmoespai.com\/cat\/que-es-la-gravetat\/\">Qu\u00e8 \u00e9s la gravetat?<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.cosmoespai.com\/cat\/per-que-hi-ha-mes-materia-que-antimateria-a-lunivers\/\">Per qu\u00e8 hi ha m\u00e9s mat\u00e8ria que antimat\u00e8ria a l\u2019univers?<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.cosmoespai.com\/cat\/que-es-lantimateria\/\">Qu\u00e8 \u00e9s l\u2019antimat\u00e8ria?<\/a><\/li>\n<li><a class=\"wp-block-latest-posts__post-title\" href=\"https:\/\/www.cosmoespai.com\/cat\/per-que-els-centres-de-les-galaxies-contenen-forats-negres\/\">Per qu\u00e8 els centres de les gal\u00e0xies contenen forats negres?<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>La Via L\u00e0ctia \u00e9s la nostra gal\u00e0xia, on es troba el sistema solar, que est\u00e0 format per 8 planetes i les seves llunes. Tot i<span class=\"read-more-link\"><a class=\"read-more\" href=\"https:\/\/www.cosmoespai.com\/cat\/quantes-estrelles-hi-ha-a-la-via-lactia\/\">Continuar llegint<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":215,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":""},"categories":[8,1],"tags":[193,31,194,192,191,12],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/11\/Estrelles_Via_L\u00e0ctia.jpg?fit=720%2C405","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":104,"url":"https:\/\/www.cosmoespai.com\/cat\/la-nostra-galaxia-la-via-lactia\/","url_meta":{"origin":214,"position":0},"title":"La nostra gal\u00e0xia: la Via L\u00e0ctia","author":"Ferran","date":"1 de juliol de 2020","format":false,"excerpt":"La Via L\u00e0ctia es va formar aproximadament fa uns 13 600 milions d\u2019anys, amb un marge d\u2019error d\u2019uns 800 milions d\u2019anys. Al mateix temps de la formaci\u00f3 la Via L\u00e0ctia, es va formar el sistema solar, i uns 200 000 milions o 300 000 milions d\u2019estrelles m\u00e9s. Tot i aix\u00ed,\u2026","rel":"","context":"A &quot;General&quot;","block_context":{"text":"General","link":"https:\/\/www.cosmoespai.com\/cat\/category\/general\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/07\/Via-Lactia-1.jpg?fit=720%2C405&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/07\/Via-Lactia-1.jpg?fit=720%2C405&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/07\/Via-Lactia-1.jpg?fit=720%2C405&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/07\/Via-Lactia-1.jpg?fit=720%2C405&resize=700%2C400 2x"},"classes":[]},{"id":40,"url":"https:\/\/www.cosmoespai.com\/cat\/una-propera-collisio-amb-andromeda\/","url_meta":{"origin":214,"position":1},"title":"Una propera col\u00b7lisi\u00f3 amb Andr\u00f2meda?","author":"Ferran","date":"3 de maig de 2020","format":false,"excerpt":"Fa molts anys, es va descobrir que la Via L\u00e0ctia i la nostra gal\u00e0xia ve\u00efna, Andr\u00f2meda, anaven en un rumb de col\u00b7lisi\u00f3. Molta gent pot pensar que xocaran i acabar\u00e0 en una explosi\u00f3 magistral entre les dues gal\u00e0xies, per\u00f2 qu\u00e8 passar\u00e0 en realitat? Al Grup Local (el conjunt de les\u2026","rel":"","context":"A &quot;Gal\u00e0xies&quot;","block_context":{"text":"Gal\u00e0xies","link":"https:\/\/www.cosmoespai.com\/cat\/category\/galaxies\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/05\/Col\u00b7lisi\u00f3_Amb_Andr\u00f2meda.jpg?fit=720%2C405&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/05\/Col\u00b7lisi\u00f3_Amb_Andr\u00f2meda.jpg?fit=720%2C405&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/05\/Col\u00b7lisi\u00f3_Amb_Andr\u00f2meda.jpg?fit=720%2C405&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2020\/05\/Col\u00b7lisi\u00f3_Amb_Andr\u00f2meda.jpg?fit=720%2C405&resize=700%2C400 2x"},"classes":[]},{"id":900,"url":"https:\/\/www.cosmoespai.com\/cat\/la-galaxia-dandromeda-el-nostre-vei-cosmic\/","url_meta":{"origin":214,"position":2},"title":"La gal\u00e0xia d\u2019Andr\u00f2meda: el nostre ve\u00ed c\u00f2smic","author":"Ferran","date":"24 d'abril de 2023","format":false,"excerpt":"La gal\u00e0xia d\u2019Andr\u00f2meda, tamb\u00e9 coneguda com a M31, \u00e9s una gal\u00e0xia espiral que es troba a uns 2,5 milions d\u2019anys llum de la Via L\u00e0ctia, sent la gal\u00e0xia m\u00e9s propera a nosaltres. Tamb\u00e9 \u00e9s l\u2019objecte m\u00e9s lluny\u00e0 que es pot veure a simple vista en una nit fosca. \u00c9s per\u2026","rel":"","context":"A &quot;Gal\u00e0xies&quot;","block_context":{"text":"Gal\u00e0xies","link":"https:\/\/www.cosmoespai.com\/cat\/category\/galaxies\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/04\/Galaxia_Adromeda.jpg?fit=720%2C405&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/04\/Galaxia_Adromeda.jpg?fit=720%2C405&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/04\/Galaxia_Adromeda.jpg?fit=720%2C405&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/04\/Galaxia_Adromeda.jpg?fit=720%2C405&resize=700%2C400 2x"},"classes":[]},{"id":826,"url":"https:\/\/www.cosmoespai.com\/cat\/en-quin-lloc-de-lunivers-es-troba-la-terra\/","url_meta":{"origin":214,"position":3},"title":"En quin lloc de l\u2019univers es troba la Terra?","author":"Ferran","date":"1 de gener de 2023","format":false,"excerpt":"La Terra, tamb\u00e9 anomenada el planeta blau, \u00e9s el tercer planeta que orbita el Sol. Aquest \u00faltim \u00e9s un dels milers de milions d\u2019estels que formen la nostra gal\u00e0xia: la Via L\u00e0ctia. La Via L\u00e0ctia \u00e9s una gal\u00e0xia espiral, pel que podem diferenciar-ne dues zones principals. Una d\u2019elles \u00e9s l\u2019anomenat\u2026","rel":"","context":"A &quot;La Terra&quot;","block_context":{"text":"La Terra","link":"https:\/\/www.cosmoespai.com\/cat\/category\/sistema-solar\/la-terra\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/01\/Situaci\u00f3_Terra.jpg?fit=720%2C405&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/01\/Situaci\u00f3_Terra.jpg?fit=720%2C405&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/01\/Situaci\u00f3_Terra.jpg?fit=720%2C405&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/01\/Situaci\u00f3_Terra.jpg?fit=720%2C405&resize=700%2C400 2x"},"classes":[]},{"id":939,"url":"https:\/\/www.cosmoespai.com\/cat\/per-que-els-centres-de-les-galaxies-contenen-forats-negres\/","url_meta":{"origin":214,"position":4},"title":"Per qu\u00e8 els centres de les gal\u00e0xies contenen forats negres?","author":"Ferran","date":"11 de juny de 2023","format":false,"excerpt":"Des dels anys 60 se sap que la majoria de les gal\u00e0xies contenen un forat negre al seu centre. Aquests forats negres tenen masses de l\u2019ordre de milions de vegades la massa del Sol, i s\u2019anomenen forats negres supermassius. Els primers forats negres d\u2019aquest tipus es van descobrir gr\u00e0cies als\u2026","rel":"","context":"A &quot;Gal\u00e0xies&quot;","block_context":{"text":"Gal\u00e0xies","link":"https:\/\/www.cosmoespai.com\/cat\/category\/galaxies\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/06\/PerQue_GalaxiesTenenForatsNegres.jpg?fit=720%2C405&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/06\/PerQue_GalaxiesTenenForatsNegres.jpg?fit=720%2C405&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/06\/PerQue_GalaxiesTenenForatsNegres.jpg?fit=720%2C405&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/06\/PerQue_GalaxiesTenenForatsNegres.jpg?fit=720%2C405&resize=700%2C400 2x"},"classes":[]},{"id":925,"url":"https:\/\/www.cosmoespai.com\/cat\/quantes-estrelles-hi-ha-a-lunivers\/","url_meta":{"origin":214,"position":5},"title":"Quantes estrelles hi ha a l\u2019univers?","author":"Ferran","date":"28 de maig de 2023","format":false,"excerpt":"En una nit sense n\u00favols, lluny de la ciutat, es poden arribar a veure uns quants milers d\u2019estrelles a simple vista. Utilitzant un simple telescopi amateur, milions d\u2019estrelles m\u00e9s apareixen davant dels nostres ulls. Comptar totes les estrelles del cel no \u00e9s viable. Aix\u00ed doncs, com poden saber els cient\u00edfics\u2026","rel":"","context":"A &quot;General&quot;","block_context":{"text":"General","link":"https:\/\/www.cosmoespai.com\/cat\/category\/general\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/05\/Numero_Estrelles_Univers.jpg?fit=720%2C405&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/05\/Numero_Estrelles_Univers.jpg?fit=720%2C405&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/05\/Numero_Estrelles_Univers.jpg?fit=720%2C405&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.cosmoespai.com\/cat\/wp-content\/uploads\/2023\/05\/Numero_Estrelles_Univers.jpg?fit=720%2C405&resize=700%2C400 2x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/posts\/214"}],"collection":[{"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/comments?post=214"}],"version-history":[{"count":1,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/posts\/214\/revisions"}],"predecessor-version":[{"id":216,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/posts\/214\/revisions\/216"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/media\/215"}],"wp:attachment":[{"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/media?parent=214"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/categories?post=214"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cosmoespai.com\/cat\/wp-json\/wp\/v2\/tags?post=214"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}