{"id":418086,"date":"2026-05-08T14:44:09","date_gmt":"2026-05-08T14:44:09","guid":{"rendered":"https:\/\/www.newsbeep.com\/nz\/418086\/"},"modified":"2026-05-08T14:44:09","modified_gmt":"2026-05-08T14:44:09","slug":"after-30-years-of-mystery-nasas-webb-telescope-captures-neptunes-aurora-for-the-first-time","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/nz\/418086\/","title":{"rendered":"After 30 Years of Mystery, NASA’s Webb Telescope Captures Neptune’s Aurora for the First Time"},"content":{"rendered":"

For the first time, NASA\u2019s James Webb Space Telescope has revealed the elusive auroras of Neptune. This groundbreaking discovery has solved a decades-long mystery, finally imaging the bright auroral activity on the ice giant that was first hinted at during NASA\u2019s Voyager 2 mission in 1989. The new data offers a detailed look at the planet\u2019s atmosphere and magnetic field, shedding light on a previously hidden aspect of our solar system.<\/p>\n

Though scientists had long suspected that Neptune experienced auroras similar to those seen on other gas giants, confirming their presence was no easy feat. The auroras, caused by solar particles interacting with Neptune\u2019s magnetic field, had eluded detection until Webb\u2019s advanced infrared capabilities provided the breakthrough astronomers had been waiting for. <\/p>\n

A New View of Neptune\u2019s Auroras<\/p>\n

Auroras <\/a>occur when charged particles from the Sun are captured by a planet\u2019s magnetic field and collide with its atmosphere, creating bursts of light. On Earth, these stunning displays are typically seen near the poles, where the magnetic field lines converge. However, the ice giant\u2019s auroras are located at mid-latitudes, a characteristic that sets them apart from those on other planets.<\/p>\n

\"DetectionDetection of the H\u2083\u207a cation on Neptune. Credit: Nature Astronomy<\/p>\n

As explained by a press release published by the NASA<\/a>, the discovery was made possible by Webb\u2019s Near-Infrared Spectrograph<\/a>, which captured the auroras in vivid detail. According to Henrik Melin<\/a>, the lead researcher from Northumbria University, the clarity of the auroras came as a surprise. <\/p>\n

\u201cIt was so stunning to not just see the auroras, but the detail and clarity of the signature really shocked me,\u201d he said.<\/p>\n

According to a study,\u00a0published in\u00a0Nature Astronomy<\/a>, this sensitivity to infrared light allowed the team to observe not only the auroras but also to detect the presence of trihydrogen cation (H3+), a molecule that forms in auroral activity and has been used as a marker of such phenomena on other gas giants like Jupiter <\/a>and Saturn<\/a>.<\/p>\n

\u201cH3+\u00a0has a been a clear signifier on all the gas giants \u2014 Jupiter, Saturn, and Uranus \u2014 of auroral activity, and we expected to see the same on Neptune as we investigated the planet over the years with the best ground-based facilities available,\u201d\u00a0noted Heidi Hammel<\/a>, an interdisciplinary scientist for Webb at the Association of Universities for Research in Astronomy.<\/p>\n

A Magnetic Field Like No Other<\/p>\n

Those auroras are unusual in more ways than one. This is due to the planet\u2019s tilted magnetic field, which was first observed during the Voyager 2 flyby<\/a>. Unlike most planets, Neptune\u2019s magnetic field is tilted by 47 degrees from the planet\u2019s rotational axis, resulting in auroras that are far from the poles. Hammel explained the connection between the tilt and the location of the auroras.<\/p>\n

\u201cSince auroral activity is based where the magnetic fields converge into the planet\u2019s atmosphere, Neptune\u2019s auroras are far from\u00a0its rotational\u00a0poles,\u201d said the U.S Space Agency.<\/p>\n

How Neptune\u2019s Atmosphere Has Cooled Over the Past Few Years<\/p>\n

Webb\u2019s observations also shed light on a significant change in the planet\u2019s upper atmosphere. Data from Webb revealed that Neptune\u2019s atmosphere has cooled substantially since Voyager 2\u2019s flyby. The temperature of the eighth planet from the Sun\u2019s upper atmosphere in 2023 was about half of what it was 30 years ago. This cooling could be one reason why Neptune\u2019s auroras were so difficult to detect in the past. <\/p>\n

\"LeftLeft: Enhanced-color image of Neptune from Hubble. Right:Combined with data from James Webb. Credit: NASA, ESA, CSA, STScI, Heidi Hammel (AURA), Henrik Melin (Northumbria University), Leigh Fletcher (University of Leicester), Stefanie Milam (NASA-GSFC)<\/p>\n

\u201cA substantially colder temperature would result in much fainter aurorae,\u201d the authors said. \u201cThis cold temperature is likely the reason that Neptune\u2019s aurorae have remained undetected for so long.\u201d<\/p>\n

The drastic drop in temperature also suggests that the atmosphere can undergo significant changes despite its distance from the Sun, more than 30 times farther away than Earth. The findings from Webb have opened up new avenues for studying the planet. The telescope\u2019s ability to detect auroras in infrared wavelengths has given astronomers a clearer view of the planet\u2019s magnetic field and its atmospheric conditions. <\/p>\n

As Webb continues its observations of Neptune over the next solar cycle, scientists hope to gather even more data that could reveal the origins of Neptune\u2019s magnetic field and further explain the planet\u2019s unique characteristics.<\/p>\n

\"TheThe NIRSpec data from JWST on Neptune. Credit: Nature Astronomy<\/p>\n

As we look ahead and dream of future missions to Uranus and Neptune, we now know how important it will be to have instruments tuned to the wavelengths of infrared light to continue to study the auroras,\u201d concluded Leigh Fletcher<\/a> of Leicester University, co-author on the paper. \u201cThis observatory has finally opened the window onto this last, previously hidden ionosphere of the giant planets.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"For the first time, NASA\u2019s James Webb Space Telescope has revealed the elusive auroras of Neptune. This groundbreaking…\n","protected":false},"author":2,"featured_media":418087,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[111,139,69,147,392],"class_list":["post-418086","post","type-post","status-publish","format-standard","has-post-thumbnail","category-space","tag-new-zealand","tag-newzealand","tag-nz","tag-science","tag-space"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/418086","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=418086"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/418086\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/418087"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=418086"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=418086"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=418086"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}