{"id":304163,"date":"2026-07-18T21:21:08","date_gmt":"2026-07-18T21:21:08","guid":{"rendered":"https:\/\/www.europesays.com\/fi\/304163\/"},"modified":"2026-07-18T21:21:08","modified_gmt":"2026-07-18T21:21:08","slug":"pelottava-paljastus-aurinkokunnan-lahimenneisyydesta-vieras-tahti-kulki-lahelta","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fi\/304163\/","title":{"rendered":"Pelottava paljastus aurinkokunnan l\u00e4himenneisyydest\u00e4: Vieras t\u00e4hti kulki l\u00e4helt\u00e4"},"content":{"rendered":"<p>\n\tLauri Heikkil\u00e4\t18.7.2026 22:22, muokattu<br \/>\n\t16.7.2026 18:26\n<\/p>\n<p>\t\t\t\t\t\t\t\t\tT\u00e4htitiede<\/p>\n<p class=\"wp-block-paragraph\">Tuoreiden tutkimustulosten perusteella voi olettaa, ett\u00e4 vieras t\u00e4hti kulki aurinkokunnan l\u00e4helt\u00e4 noin 2,5 miljoonaa vuotta sitten 6000\u201310 000 astronomisen yksik\u00f6n et\u00e4isyydell\u00e4 auringosta. Aiemmin et\u00e4isyyden on arveltu olleen suurempi.<\/p>\n<p class=\"wp-block-paragraph\">Yksikk\u00f6 vastaa Maapallon ja Auringon v\u00e4list\u00e4 et\u00e4isyytt\u00e4.<\/p>\n<p class=\"wp-block-paragraph\">Aurinkokunnan mittakaavassa ohitus tapahtui siis melko l\u00e4helt\u00e4 ja melko \u00e4skett\u00e4in.<\/p>\n<p class=\"wp-block-paragraph\">Komeettojen kiertoratoja havainnoimalla PSI-instituutti sai selville, ett\u00e4 HD 7977 olisi tehnyt t\u00e4llaisen l\u00e4hiohituksen mainittuna ajankohtana. T\u00e4hti on avittanut my\u00f6s uusien komeettojen syntymist\u00e4. Massiivinen painovoimavaikutus vaikutti selv\u00e4sti komeettojen kiertoratoihin.<\/p>\n<p class=\"wp-block-paragraph\">Asiasta <a href=\"https:\/\/www.avaruus.fi\/uutiset\/tahdet-sumut-ja-galaksit\/komeettojen-radat-kertovat-taehden-laehiohituksesta.html\" rel=\"nofollow noopener\" target=\"_blank\">kertoi<\/a> aiemmin T\u00e4hdet ja avaruus.<\/p>\n<p class=\"wp-block-paragraph\">PSI-instituutin <a href=\"https:\/\/www.psi.edu\/blog\/long-period-comets-orbits-reflect-close-passage-by-star-hd-7977\/\" rel=\"nofollow noopener\" target=\"_blank\">tiedote<\/a> (englanniksi)<\/p>\n","protected":false},"excerpt":{"rendered":"Lauri Heikkil\u00e4 18.7.2026 22:22, muokattu 16.7.2026 18:26 T\u00e4htitiede Tuoreiden tutkimustulosten perusteella voi olettaa, ett\u00e4 vieras t\u00e4hti kulki aurinkokunnan&hellip;\n","protected":false},"author":2,"featured_media":304164,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[165],"tags":[1825,13694,453,33,31,30,166,13695,32,9460,779,167],"class_list":["post-304163","post","type-post","status-publish","format-standard","has-post-thumbnail","category-terveys","tag-aurinko","tag-aurinkokunta","tag-avaruus","tag-fi","tag-finland","tag-finnish","tag-health","tag-komeetat","tag-suomi","tag-tahdet","tag-tahtitiede","tag-terveys"],"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@fi\/116943079792714235","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/posts\/304163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/comments?post=304163"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/posts\/304163\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/media\/304164"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/media?parent=304163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/categories?post=304163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/fi\/wp-json\/wp\/v2\/tags?post=304163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}