--- title: Hottest Planet Found Has Similar Temperature to Stars description: The hottest planet ever discovered has a surface that is nearly as hot as the Sun, scientists say canonical: https://time.com/4807163/exoplanet-hottest-planet-sun-kelt9b/ author: Mahita Gajanan article:opinion: false article:content_tier: free article:published_time: 2017-06-06T15:24:43.000Z article:modified_time: 2026-02-23T05:17:08.975Z article:section: Science og:title: Scientists Have Discovered a Planet That's as Hot as a Star og:description: It's the hottest planet ever discovered og:url: https://time.com/4807163/exoplanet-hottest-planet-sun-kelt9b/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltb1eb73bbe6c5a5f8/6988d055a988ca6cdb6bc8c3/kelt-9b-fb.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 1314 og:image:height: 739 og:image:alt: kelt-9b-fb og:type: article twitter:card: summary_large_image twitter:title: Scientists Have Discovered a Planet That's as Hot as a Star twitter:description: It's the hottest planet ever discovered twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltb1eb73bbe6c5a5f8/6988d055a988ca6cdb6bc8c3/kelt-9b-fb.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # Scientists Have Discovered a Planet That's as Hot as a Star by [Mahita Gajanan](https://time.com/author/mahita-gajanan/) ## Mahita Gajanan Gajanan is an editor at TIME. Jun 6, 2017 3:24 PM UTC  NASA/JPL-Caltech by [Mahita Gajanan](https://time.com/author/mahita-gajanan/) ## Mahita Gajanan Gajanan is an editor at TIME. Jun 6, 2017 3:24 PM UTC The hottest planet ever discovered has a surface that is nearly as hot as the sun, scientists say. KELT-9b, a gas giant about 650 light years away from Earth, reaches about 7,770 degrees Fahrenheit during the day, researchers said in a study published in [_Nature_](https://www.nature.com/nature/journal/vaop/ncurrent/full/nature22392.html) this week. According to the study authors, KELT-9b is so hot because it is very close to its exceptionally hot host star. It takes just two days for the planet, which is about twice the size of Jupiter, to orbit its star. Researchers discovered the planet in 2014, and found that, apart from its heat, the KELT-9b had an odd makeup. The planet orbits around the poles of its star, rather than its equator, and is tidally locked, meaning it does not spin on its axis. ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/4807163/exoplanet-hottest-planet-sun-kelt9b/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/4807163/exoplanet-hottest-planet-sun-kelt9b/"},"headline":"Scientists Have Discovered a Planet That's as Hot as a Star","datePublished":"2017-06-06T15:24:43.000Z","dateModified":"2026-02-23T05:17:08.975Z","description":"It's the hottest planet ever discovered","url":"https://time.com/4807163/exoplanet-hottest-planet-sun-kelt9b/","keywords":["Space","onetime"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltb1eb73bbe6c5a5f8/6988d055a988ca6cdb6bc8c3/kelt-9b-fb.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Mahita Gajanan","jobTitle":"Gajanan is an editor at TIME.","url":"https://time.com/author/mahita-gajanan/"}],"articleSection":"Science","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltb1eb73bbe6c5a5f8/6988d055a988ca6cdb6bc8c3/kelt-9b-fb.jpg?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"kelt-9b-fb","caption":"This artist's concept shows planet KELT-9b orbiting its host star, KELT-9. It is the hottest gas giant planet discovered so far.","creditText":"NASA/JPL-Caltech","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/section/science/","name":"Science"}},{"@type":"ListItem","position":2,"item":{"@id":"/tag/space/","name":"Space"}},{"@type":"ListItem","position":3,"item":{"@id":"https://time.com/4807163/exoplanet-hottest-planet-sun-kelt9b/","name":"Scientists Have Discovered a Planet That's as Hot as a Star"}}]}] ```