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New auroras detected on Jupiter’s 4 largest moons


Astronomers have found new auroras over Jupiter’s 4 largest moons: Io, Europa, Ganymede, and Callisto, observable at seen wavelengths. The new auroras reveal in better element the composition of the skinny atmospheres of those Jovian moons, together with traces of oxygen and sodium, however solely minimal water vapor. 

The crew made the invention whereas observing the moons as they sat within the shadow of Jupiter, the solar system’s largest planet, utilizing the Keck Observatory’s High-Resolution Echelle Spectrometer (HIRES) in addition to high-resolution spectrographs on the Large Binocular Telescope and Apache Point Observatory.





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