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Comet 3I/ATLAS released water vapor at record distance from the Sun, surprising scientists.
On October 30, 2025, interstellar comet 3I/ATLAS reached its closest point to the Sun, revealing unexpected water vapor release despite being nearly three times farther from the Sun than Earth.
NASA’s Swift Observatory detected hydroxyl gas, a sign of water, at a rate of about 40 kg per second, challenging assumptions about when comets typically activate.
The 7-billion-year-old object, the oldest ever studied, is now fading from view but will reappear in mid-November for further observation.
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El cometa 3I/ATLAS liberó vapor de agua a una distancia récord del Sol, sorprendendo a los científicos.