{"id":32013,"date":"2023-07-08T16:09:42","date_gmt":"2023-07-08T16:09:42","guid":{"rendered":"https:\/\/www.africa-press.net\/mauritius\/all-news\/astronomers-find-puzzling-planet-that-shouldnt-exist-orbiting-red-giant-star"},"modified":"2023-07-08T16:39:35","modified_gmt":"2023-07-08T16:39:35","slug":"astronomers-find-puzzling-planet-that-shouldnt-exist-orbiting-red-giant-star","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/mauritius\/all-news\/astronomers-find-puzzling-planet-that-shouldnt-exist-orbiting-red-giant-star","title":{"rendered":"Astronomers Find Puzzling Planet That \u2018Shouldn\u2019t Exist\u2019 Orbiting Red Giant Star"},"content":{"rendered":"

Africa-Press – Mauritius. <\/strong><\/span>Orbiting the red giant star Baekdu about 520 light-years from Earth is a Jupiter-sized planet called Halla. However, there\u2019s something extremely unusual about Halla: it shouldn\u2019t exist anymore, according to all-known scientific reasoning.<\/p>\n

While at the present, Halla orbits about 0.49 astronomical units (AU) away from its host star, or about half the distance from the Earth to our sun, that wasn\u2019t always the case.<\/p>\n

Baekdu is a red giant in the late stages of its life, having already shrunk back from a period in which it had ballooned outward to many times its present diameter.<\/p>\n

According to the work of a group of astronomers based at the University of Sydney in Australia, and published on Wednesday in Nature, that diameter was once wider than Halla\u2019s orbit, meaning the star should\u2019ve swallowed the planet and incinerated it.<\/p>\n

Yet, it survived. The team\u2019s findings detailed Baekdu\u2019s surface inflated outward to roughly 1.5 times the radius of Halla\u2019s orbit. The bizarre behavior is a natural part of a star\u2019s life, as its hydrogen fuel becomes converted into helium and the fusion process changes.<\/p>\n

It\u2019ll happen to our sun, too, and the Earth will most likely be engulfed along with Mercury and Venus, and possibly also Mars. The astronomers have considered a range of options for explaining Halla\u2019s survival, but none is really satisfactory.<\/p>\n

One possible explanation is that Halla formed after Baekdu\u2019s massive expansion phase; another is that Baekdu was once part of a binary star system, but consumed its partner star, which stopped it from expanding to consume Halla.<\/p>\n

A third possibility is that Halla is a captured rogue planet, or that it migrated to its present orbit from further out in the Baekdu system; however, close studies of the planet\u2019s orbit suggest this is unlikely.<\/p>\n

\u201cIf the Baekdu system originally consisted of two stars, their merger could have prevented any one of them from expanding sufficiently to engulf the planet.<\/p>\n

\u201d Astronomers have also recently discovered a binary star system with multiple planets for the second time.<\/p>\n

While single-planet binary systems have been found to be common, scientists had believed binary star systems were too unstable to support multiple stable planetary orbits.<\/p>\n

For More News And Analysis About Mauritius<\/a> Follow Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – Mauritius. Orbiting the red giant star Baekdu about 520 light-years from Earth is a Jupiter-sized planet called Halla. However, there\u2019s something extremely unusual about Halla: it shouldn\u2019t exist anymore, according to all-known scientific reasoning. While at the present, Halla orbits about 0.49 astronomical units (AU) away from its host star, or about half […]<\/p>\n","protected":false},"author":84,"featured_media":32012,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,9],"tags":[233,245,845,241],"class_list":["post-32013","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-all-news","category-miscellaneous","tag-africa-press","tag-africa-press-mauritius","tag-earth","tag-mauritius"],"yoast_head":"\nAstronomers Find Puzzling Planet That \u2018Shouldn\u2019t Exist\u2019 Orbiting Red Giant Star - Mauritius<\/title>\n<meta name=\"description\" content=\"Orbiting the red giant star Baekdu about 520 light-years from Earth is a Jupiter-sized planet called Halla. 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