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The spacecraft, called Juice<\/a>, wasn\u2019t meant to study comets. It\u2019s heading to Jupiter to explore icy moons<\/a>. <\/p>\n But in November 2025, it happened to be in the right place at the right time. Teams quickly turned on five instruments and aimed them at the comet as it approached the Sun.<\/p>\n The data took three months to reach Earth. Once it arrived, scientists started analyzing images, light, and chemical signals. The work is still ongoing, but some early findings are already clear.<\/p>\n Water vapor from comet 3I\/ATLAS<\/p>\n Juice picked up a very strong water signal. As comet 3I\/ATLAS moved closer to the Sun, its icy surface heated up and released gas.<\/p>\n They detected about 4,400 pounds (2,000 kilograms) of water vapor every second. That equals around 70 Olympic-sized swimming pools each day.<\/p>\n This level is high but not unusual for comets. Some release less, while others release much more. It depends on the comet\u2019s size and distance from the Sun. What stood out was how steady the flow remained, even days after its closest approach.<\/p>\n Sunlight shapes the flow<\/p>\n Most of that water didn\u2019t escape evenly. It streamed mainly from the side facing the Sun. That tells scientists something about how heat drives activity on the comet\u2019s surface.<\/p>\n Even more interestingly, a large portion of the water may not come directly from the solid core. Instead, it likely comes from tiny icy dust grains floating around the comet in a hazy cloud. These grains heat up and release gas on their own, adding to the total output.<\/p>\n Researchers are also studying different types of water<\/a> in the comet. Some early findings from other telescopes suggest an unusual chemical ratio \u2013 one that hints the comet formed in an extremely cold and ancient region of space.<\/p>\n Comet 3I\/ATLAS has a very long tail<\/p>\n The comet didn\u2019t just release gas. It carried a long trail of dust and atoms behind it. Observations show that this material stretched more than 3.1 million miles (5 million kilometers) from the comet\u2019s center.<\/p>\n That\u2019s not surprising for an active comet, but it\u2019s still impressive. These long comet tails form when sunlight and solar wind push material away, creating a glowing trail that can extend for millions of miles.<\/p>\n In this case, scientists detected oxygen, hydrogen, and carbon spreading across that vast distance.<\/p>\n Despite its origins beyond our solar system, comet 3I\/ATLAS didn\u2019t behave like an outsider. High-resolution images showed a classic comet structure. A bright cloud surrounded the hidden core, with two distinct tails trailing behind.<\/p>\n One of the comet\u2019s tail pointed away from the Sun<\/a>, shaped by solar radiation. The other followed the comet\u2019s path through space.<\/p>\n Subtle patterns within these features suggest ongoing interactions with solar particles and magnetic fields. Even so, everything looked strikingly familiar.<\/p>\n That similarity matters. It suggests that the basic processes shaping comets may be common across different star systems.<\/p>\n Tracking helps protect Earth<\/p>\n One instrument on board wasn\u2019t meant for science at all. It was meant to help the spacecraft move around Jupiter\u2019s moons<\/a>. But during this moment, it ended up doing something different.<\/p>\n From about 37 million miles (60 million kilometers) away, its camera tracked the comet from a view Earth-based telescopes didn\u2019t have. By combining those views, scientists were able to map the comet\u2019s path more accurately.<\/p>\n This kind of tracking helps with planetary defense. It gives scientists a better idea of how objects move, especially when they\u2019re hard to see from Earth<\/a>. It also reveals how jets of gas and dust can slightly alter a comet\u2019s course over time.<\/p>\n Multiple teams, many instruments<\/p>\n The work involves teams across multiple instruments, each focusing on a different piece of the puzzle. As the data came together, the significance of the moment became clear.<\/p>\n \u201c3I\/ATLAS is a rare and unexpected visitor, its arrival came as a complete surprise,\u201d said Olivier Witasse, ESA<\/a> Juice Project Scientist.<\/p>\n \u201cBut when we realized that Juice would be close to the comet around its closest approach to the Sun, we realized what a unique opportunity this was to collect a once-in-a-lifetime dataset.\u201d<\/p>\n \u201cObserving the comet was challenging, with no guarantee of success, but in the end, it turned into a great bonus for Juice during its journey to Jupiter<\/a>.\u201d<\/p>\n Looking ahead to Jupiter<\/p>\n The Juice spacecraft itself continues its long trip toward Jupiter, where it will arrive in 2031. Along the way, its instruments will be tested again during future flybys.<\/p>\n \u201cThe data we are already seeing from Juice\u2019s instruments is really promising,\u201d said ESA co-Project Scientist Claire Vallat.<\/p>\n \u201cWe are getting more excited about how well they work and how much we will reveal about Jupiter and its icy moons in the 2030s.\u201d<\/p>\n For now, 3I\/ATLAS has already left its mark. It offered a rare glimpse into material formed in another star system, and it did so in a brief window that scientists were ready to seize.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"A comet passed through our solar system in late 2025, but it wasn\u2019t from here. 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<\/a>GIF of Comet 3I\/Atlas switching between orange and blue views of a bright, glowing object sitting slightly above the center of the image, with a soft, teardrop-shaped head and a long, faint tail streaming downward. The orange view also has a tail pointing to the lower left. Credit: ESA. Click image to enlarge.Surprisingly familiar behavior<\/p>\n