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The story began on July 1, 2025, when the Asteroid Terrestrial-impact Last Alert System (ATLAS) spotted a faint, moving point of light. “If this thing is a comet, then it continues to be the strangest comet we’ve ever seen. And if it’s something else, then the world is about to find out because 3I/ATLAS is coming for us next.” “Since 3I/ATLAS also has a coma of gas and dust, the red color actually made sense. One of the few normal things about this object until 3I/ATLAS mysteriously turned green in early September.”“If there was anything that 3I/ATLAS has done so far that would indicate alien engine technology, then this would be it. As 3I/ATLAS enters its perihelion with the Sun, it starts to experience non-gravitational acceleration for the first time, which means that it is moving under its own propulsion. And this thing is moving fast.” Supporting this, data from the SPHEREx mission detected strong carbon dioxide emissions alongside signatures of water-ice absorption, indicating that the object remained structurally intact while releasing a chemically unusual mix of material.Images of 3I/ATLAS from November 2025 show multiple jets of dust and gas fanning out in different directions rather than forming a single continuous tail. The scale and persistence of these features place 3I/ATLAS at the extreme end of known cometary behavior. In this sense, 3I/ATLAS is both unusual and illuminating, linking distant star systems and revealing the Milky Way's diversity.
