NASA’s JWST space telescope has observed a 10,000-kilometer-long plume of water vapor jetting into space from Saturn’s moon Enceladus—the largest spray ever detected from the icy world.
“It’s staggering to have such a huge plume from such a small object,” says Christopher Parkinson, a planetary scientist at the California Institute of Technology who was not part of the JWST study.
JWST observed the vast plume on 9 November 2022 using its high-resolution infrared spectrometer to capture faint fluorescent emissions caused by sunlight striking water molecules near the moon. In just 4.5 minutes, the telescope saw this plume extending about 20 times farther into space than the diameter of Enceladus itself.
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