{"id":71935,"date":"2025-07-18T06:27:08","date_gmt":"2025-07-18T06:27:08","guid":{"rendered":"https:\/\/www.europesays.com\/us\/71935\/"},"modified":"2025-07-18T06:27:08","modified_gmt":"2025-07-18T06:27:08","slug":"nasa-oxford-discover-warmer-uranus-than-once-thought","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/us\/71935\/","title":{"rendered":"NASA, Oxford Discover Warmer Uranus Than Once Thought"},"content":{"rendered":"<p class=\"has-text-align-center\"><strong>KEY POINTS<\/strong><\/p>\n<ul class=\"wp-block-list\">\n<li>Jupiter, Saturn, and Neptune each emit more energy than they receive from the Sun, meaning they have comparatively warm interiors.<\/li>\n<li>NASA\u2019s Uranus flyby with Voyager 2 in 1986 found the planet colder than expected, which challenged ideas of how planets formed and evolved.<\/li>\n<li>However, with advanced computer modeling and a new look at old data, scientists think the planet may actually be warmer than previously expected.<\/li>\n<\/ul>\n<p>For millennia, astronomers thought Uranus was no more than a distant star. It wasn\u2019t until the late 18th century that Uranus was universally accepted as a planet. To this day, the ringed, blue world subverts scientists\u2019 expectations, but new NASA research helps puzzle out some of the world\u2019s mystique.\u00a0<\/p>\n<p>Uranus is unlike any other planet in our solar system. It spins on its side, which means each pole directly faces the Sun for a continuous 42-year \u201csummer.\u201d Uranus also rotates in the opposite direction of all planets except Venus. Data from NASA\u2019s Voyager 2 Uranus flyby in 1986 also suggested the planet is unusually cold inside, challenging scientists to reconsider fundamental theories of how planets formed and evolved throughout our solar system.<\/p>\n<p>\u201cSince Voyager 2\u2019s flyby, everybody has said Uranus has no internal heat,\u201d said Amy Simon, a planetary scientist at NASA\u2019s Goddard Space Flight Center in Greenbelt, Maryland. \u201cBut it\u2019s been really hard to explain why that is, especially when compared with the other giant planets.\u201d<\/p>\n<p>These Uranus projections came from only one up-close measurement of the planet\u2019s emitted heat made by Voyager 2: \u201cEverything hinges on that one data point,\u201d said Simon. \u201cThat is part of the problem.\u201d\u00a0<\/p>\n<p>Now, using an advanced computer modeling technique and revisiting decades of data, Simon and a team of scientists have found that Uranus does in fact generate some heat, as they <a href=\"https:\/\/academic.oup.com\/mnras\/article\/540\/2\/1719\/8133900\" target=\"_blank\" rel=\"noreferrer noopener\">reported on May 16 in the Monthly Notices of the Royal Astronomical Society<\/a> journal.\u00a0<\/p>\n<p>A planet\u2019s internal heat can be calculated by comparing the amount of energy it receives from the Sun to the amount it of energy it releases into space in the form of reflected light and emitted heat. The solar system\u2019s other giant planets \u2014 Saturn, Jupiter, and Neptune \u2014 emit more heat than they receive, which means the extra heat is coming from inside, much of it left over from the high-energy processes that formed the planets 4.5 billion years ago. The amount of heat a planet exudes could be an indication of its age: the less heat released relative to the heat absorbed from the Sun, the older the planet is.<\/p>\n<p>Uranus stood out from the other planets because it appeared to give off as much heat as it received, implying it had none of its own. This puzzled scientists. Some hypothesized that perhaps the planet is much older than all the others and has cooled off completely. Others proposed that a giant collision \u2014 the same one that may have knocked the planet on its side \u2014 blasted out all of Uranus\u2019 heat. But none of these hypotheses satisfied scientists, motivating them to solve Uranus\u2019 cold case.<\/p>\n<p>\u201cWe thought, \u2018Could it really be that there is no internal heat at Uranus?\u2019\u201d said Patrick Irwin, the paper\u2019s lead author and professor of planetary physics at the University of Oxford in England. \u201cWe did many calculations to see how much sunshine is reflected by Uranus and we realized that it is actually more reflective than people had estimated.\u201d<\/p>\n<p>The researchers set out to determine Uranus\u2019 full energy budget: how much energy it receives from the Sun compared to how much it reflects as sunlight and how much it emits as heat. To do this, they needed to estimate  the total amount of light reflected from the planet at all angles. \u201cYou need to see the light that\u2019s scattered off to the sides, not just coming straight back at you,\u201d Simon said.<\/p>\n<p>To get the most accurate estimate of Uranus&#8217; energy budget yet, Oxford researchers developed a computer model that brought together everything known about Uranus\u2019 atmosphere from decades of observations from ground- and space-based telescopes, including NASA\u2019s Hubble Space Telescope and NASA\u2019s Infrared Telescope Facility in Hawaii. The model included information about the planet\u2019s hazes, clouds, and seasonal changes, all of which affect how sunlight is reflected and how heat escapes.<\/p>\n<p>The researchers found that Uranus releases about 15% more energy than it receives from the Sun, a figure that is similar to another recent estimate from a separate study funded in part by NASA that was <a href=\"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2025GL115660#https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/2025GL115660\" target=\"_blank\" rel=\"noreferrer noopener\">published July 14 in Geophysical Research Letters<\/a>. These studies suggest Uranus it has its own heat, though still far less than its neighbor Neptune, which emits more than twice the energy it receives.<\/p>\n<p>\u201cNow we have to understand what that remnant amount of heat at Uranus means, as well as get better measurements of it,\u201d Simon said.<\/p>\n<p>Unraveling Uranus\u2019 past is useful not only for mapping the timeline of when solar system planets formed and migrated to their current orbits, but it also helps scientists better understand many of the planets discovered outside the solar system, called exoplanets, a majority of which are the same size as Uranus.<\/p>\n<p><strong>By Emma Friedman<\/strong><br \/><strong>NASA\u2019s Goddard Space Flight Center, Greenbelt, Md.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"KEY POINTS Jupiter, Saturn, and Neptune each emit more energy than they receive from the Sun, meaning they&hellip;\n","protected":false},"author":3,"featured_media":71936,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[14409,27902,159,50340,67,132,50341,68],"class_list":{"0":"post-71935","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-science","8":"tag-planetary-science","9":"tag-planets","10":"tag-science","11":"tag-the-solar-system","12":"tag-united-states","13":"tag-unitedstates","14":"tag-uranus","15":"tag-us"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@us\/114872820806946360","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/71935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/comments?post=71935"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/71935\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media\/71936"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media?parent=71935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/categories?post=71935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/tags?post=71935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}