\tScience & Exploration<\/p>\n
\t\t\t\t\t\t06\/07\/2026
\n\t\t\t\t326 views
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In new images from the NASA\/ESA\/CSA James Webb Space Telescope<\/a> to celebrate its fourth science anniversary, a familiar galaxy transforms into something far richer, and far more complex, than ever seen before. Webb\u2019s unprecedented sensitivity across near- and mid-infrared wavelengths cuts through the thick lanes of dust that obscure Centaurus A\u2019s centre in visible light, showing a densely packed tapestry of individual stars and an active, everchanging galaxy. These images mark four years of better-than-anticipated performance and successful science operations for the most powerful space telescope in history.<\/p>\n Centaurus A (also known as NGC 5128) is 11 million light-years away from Earth, relatively close in cosmic terms. Yet, unlike most nearby galaxies, it is very active, making it a powerful laboratory for understanding how galaxies and black holes grow and evolve together.<\/p>\n At its core sits a supermassive black hole actively feeding on surrounding material. As it does, the black hole launches powerful jets and releases enormous amounts of energy, shaping the galaxy around it. At the same time, Centaurus A bears the scars of a dramatic past: a major collision with another galaxy roughly two billion years ago. The aftermath of that merger is still visible today in its unusual structure and ongoing star formation.<\/p>\n Visible light observations from the NASA\/ESA Hubble Space Telescope could not reveal the central region where dust blocked the view, while NASA\u2019s retired Spitzer Space Telescope revealed large scale structures in the infrared without resolving individual stars. Now, Webb brings both clarity and depth, exposing the galaxy\u2019s inner workings star by star<\/p>\n \tDust, awe<\/p>\n Webb\u2019s mid-infrared vision highlights the galaxy\u2019s rich dust structures, which glow in intricate shapes that surprise and even perplex astronomers. A warped, parallelogram-like band cuts across the galaxy\u2019s centre, while wisps of material stretch outward like cosmic clouds.<\/p>\n An \u201cS\u201d shaped feature, most notable in the image from Webb\u2019s MIRI (Mid-Infrared Instrument)<\/a>, is also unusual and invites questions that need further study to answer. What created this shape? How does the black hole influence it? Is it influenced by merger-induced star formation?<\/p>\n Many of the glowing red points in the MIRI image are dust-rich stars or stellar nurseries, where aging stars are shedding material back into space or new stars are forming. This dust is the raw ingredient for future generations of stars and planets, making it central to the ongoing life cycle of the galaxy.<\/p>\n \t\t\t\t\t\t\tCentaurus A (MIRI and NIRCam image)<\/a><\/p>\n \tWritten in its stars<\/p>\n With Webb\u2019s high resolution, astronomers can now study Centaurus A star by star, even in its long-obscured central region. What looks \u201cgrainy\u201d in the image from Webb, most obvious in the combined MIRI and NIRCam (Near-Infrared Camera) view, is actually a densely packed field of individual stars, together carrying information about the galaxy\u2019s past.<\/p>\n With Webb\u2019s view of Centaurus A, it becomes a case of galactic archaeology. Each star revealed helps to reconstruct when different events happened: when older stars first formed, when activity slowed down, a burst of star formation during the collision, and stars born from gas stirred in its aftermath. Together, they form a timeline of the galaxy\u2019s evolution.<\/p>\n \tDynamic black hole<\/p>\n \t\t\t\t\t\t\tCentaurus A: ground-based context<\/a><\/p>\n Webb\u2019s capabilities go beyond imaging. By analysing light with spectroscopy<\/a>, astronomers can measure how gas moves within the galaxy.<\/p>\n Early findings from Webb show fast-moving ionised gas flowing outward, likely driven by the black hole\u2019s activity, and warmer molecular hydrogen in a warped rotating disk near the centre. These observations help explore one of astronomy\u2019s biggest questions: How does a black hole influence an entire galaxy?<\/p>\n The answer appears to be complex. The black hole can trigger star formation by compressing gas, but also limit it by pushing material away. Centaurus A offers a rare, nearby view of this cosmic interplay.<\/p>\n By tracing dust in never-before-seen detail, resolving millions of stars, and revealing the motion of gas near a supermassive black hole, Webb transforms Centaurus A into a vivid record of cosmic history.<\/p>\n \tAnother incredible year of science and imagery<\/p>\n The fourth year of Webb\u2019s science operations has delivered further groundbreaking science and discoveries from places across the Universe. Astronomers found new evidence for a planet orbiting Alpha Centauri<\/a>, just four light-years away from our Sun. Webb showcased eight spectacular gravitational lenses<\/a> out of an in-depth survey that identified hundreds of candidates. By looking into the cradles of star clusters in nearby galaxies, scientists found that more massive clusters emerge faster<\/a>; meanwhile in our own Solar System, Webb mapped the upper atmosphere and auroras of Uranus<\/a>.<\/p>\n In the early Universe, Webb revealed a black hole that formed before its galaxy did<\/a>, providing new evidence for how supermassive black holes originated, and identified a\u00a0supernova occurring just 730 million years after the Big Bang<\/a> \u2014 the earliest to date. Researchers presented the strongest evidence yet that some of the \u201clittle red dots\u201d discovered by Webb in 2022 are rapidly growing black holes enveloped in dense gas cocoons<\/a>. Webb also took a fresh look at the Hubble Ultra Deep Field, resulting in a new view that reveals thousands of distant galaxies<\/a> dating back to the earliest periods of cosmic history.<\/p>\n Among the unique images produced by Webb over the last year were the gossamer nebulae around a planet-forming disc<\/a>, intricate details in the edge of the Helix Nebula<\/a>, the complex heart of a cosmic butterfly<\/a> and young stars across every stage of formation<\/a>. Webb highlighted a beacon of light<\/a> in the swirls of galaxy Messier 77, and details of the stellar lifecycle in galaxy NGC 5134<\/a>. Webb and Hubble also joined forces to share the most comprehensive view of Saturn<\/a> to date, showing layers and storms in its atmosphere.<\/p>\n \t\t\t\tMore information<\/p>\n Webb is the largest, most powerful telescope ever launched into space. Under an international collaboration agreement, ESA provided the telescope\u2019s launch service, using the Ariane 5 launch vehicle. Working with partners, ESA was responsible for the development and qualification of Ariane 5 adaptations for the Webb mission and for the procurement of the launch service by Arianespace. ESA also provided the workhorse spectrograph NIRSpec and 50% of the mid-infrared instrument MIRI, which was designed and built by a consortium of nationally funded European Institutes (The MIRI European Consortium) in partnership with JPL and the University of Arizona.<\/p>\n