James Webb observes a sunless world that produces surprisingly intense auroras
SMRTR summary
The James Webb Space Telescope studied SIMP-0136, a "failed star" called a brown dwarf floating freely through space 20 light-years away, and discovered it produces auroras far brighter than Earth's northern lights despite having no sun. The rogue world's powerful magnetic field interacts with charged particles from interstellar space to create these intense auroras, heating its upper atmosphere to temperatures 570 degrees Fahrenheit hotter than expected.
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