{"id":971,"date":"2005-09-09T08:18:00","date_gmt":"2005-09-09T06:18:00","guid":{"rendered":"https:\/\/kids.esa.int\/cannibal_star_eats_companion\/"},"modified":"2026-10-08T00:34:22","modified_gmt":"2026-10-07T22:34:22","slug":"cannibal_star_eats_companion","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fi\/cannibal_star_eats_companion\/","title":{"rendered":"Kannibaali-elokuvan p\u00e4\u00e4osan esitt\u00e4j\u00e4 sy\u00f6 kumppaninsa"},"content":{"rendered":"<div class=\"lede\">\n<p>ESAn Integral-avaruusobservatorio on tehnyt ensimm\u00e4isen havainnon nopeasti py\u00f6riv\u00e4st\u00e4 t\u00e4hdest\u00e4, joka on nielem\u00e4ss\u00e4 pienemp\u00e4\u00e4 naapurit\u00e4hte\u00e4\u00e4n.<\/p>\n<\/div>\n<p>Py\u00f6riv\u00e4 t\u00e4hti ei ole mik\u00e4\u00e4n tavallinen t\u00e4hti. Alun perin se oli v\u00e4hint\u00e4\u00e4n kahdeksan kertaa Aurinkoa massiivisempi, mutta on romahtanut eritt\u00e4in tihe\u00e4ksi neutronit\u00e4hdeksi, jonka halkaisija on vain 20 km. Yksi teelusikallinen sen ainesta painaisi noin miljardi tonnia.<\/p>\n<p>Vaikka neutronit\u00e4hti on aivan liian pieni n\u00e4ky\u00e4kseen tavallisella kaukoputkella, se voidaan havaita r\u00f6ntgens\u00e4teilyn avulla. Integral-satelliitti l\u00f6ysi sen 2. joulukuuta 2004 suoritettavan rutiininomaisen taivaan kartoituksen aikana, kun se yht\u00e4kki\u00e4 l\u00e4hetti voimakkaan r\u00f6ntgens\u00e4teilyn purkauksen.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"400\" data-credit=\"NASA\/Dana Berry\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/08\/Animation_of_a_pulsar_eating_material_from_companion_star2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2005\/08\/animation_of_a_pulsar_eating_material_from_companion_star2\/17903491-2-eng-GB\/Animation_of_a_pulsar_eating_material_from_companion_star.jpg\" alt=\"Animation of a pulsar &#x27;eating&#x27; material from companion star\"><figcaption>Animaatio pulsarista, joka 'sy\u00f6' materiaalia kumppanit\u00e4htelt\u00e4<\/figcaption><\/figure>\n<p>Integralin ja NASA:n Rossi X-ray Timing Explorer -avaruusaluksen mittaukset osoittavat, ett\u00e4 t\u00e4m\u00e4 \u2018kannibaalit\u00e4hti\u2019 on \u201dpulsari\u201d \u2013 nopeasti py\u00f6riv\u00e4 neutronit\u00e4hti. Itse asiassa se on yksi nopeimmin py\u00f6rivist\u00e4 pulsareista, joita on koskaan l\u00f6ydetty. T\u00e4ll\u00e4 hetkell\u00e4 se py\u00f6rii huimaavalla nopeudella \u2013 noin 600 kertaa sekunnissa \u2013 ja nopeus kasvaa v\u00e4hitellen entisest\u00e4\u00e4n.<\/p>\n<p>Kierrosnopeuden kasvu tapahtuu, kun kumppanit\u00e4htest\u00e4 irronnut kaasu t\u00f6rm\u00e4\u00e4 pinnalle. T\u00e4m\u00e4 voimakas kaasun virtaus kuumentaa sen l\u00e4hes miljardin asteen l\u00e4mp\u00f6tilaan, jolloin vapautuu valtavia m\u00e4\u00e4ri\u00e4 r\u00f6ntgen- ja gammas\u00e4teily\u00e4.<\/p>\n<p>Sill\u00e4 v\u00e4lin kumppanit\u00e4hti on jo kutistunut murto-osaan Aurinkomme koosta, ehk\u00e4 jopa 40 Jupiterin massan kokoiseksi. Molemmat t\u00e4hdet ovat niin l\u00e4hell\u00e4 toisiaan, ett\u00e4 ne mahtuisivat Auringon s\u00e4teeseen. Selviyty\u00e4kseen kutistuva naapurit\u00e4hti kiert\u00e4\u00e4 neutronit\u00e4hden ymp\u00e4rill\u00e4 vain 2,5 tunnissa.<\/p>","protected":false},"excerpt":{"rendered":"<p>ESA\u2019s Integral space observatory has made its first discovery of a fast-spinning star that is swallowing its smaller neighbour. The star in a spin is no ordinary star. Originally at [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2005\/08\/artist_s_impression_of_a_pulsar_eating_a_companion_star2\/17883880-2-eng-GB\/Artist_s_impression_of_a_pulsar_eating_a_companion_star.jpg","esa_banner_description":"Artist's impression of a pulsar 'eating' a companion star","esa_banner_credit":"NASA\/Dana Berry","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/08\/Artist_s_impression_of_a_pulsar_eating_a_companion_star2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-971","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/comments?post=971"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/971\/revisions"}],"predecessor-version":[{"id":4764,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/posts\/971\/revisions\/4764"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/media?parent=971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/categories?post=971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/tags?post=971"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/panel?post=971"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/language?post=971"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/age?post=971"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/duration?post=971"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/resource_type?post=971"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/audience?post=971"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fi\/wp-json\/wp\/v2\/wf_post_folders?post=971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}