The planet’s elusive aurorae are much colder than expected, which is how they evaded detection for so long.

Scientists observed and captured the first clear evidence of auroras on Neptune using the James Webb Space Telescope (JWST), ...

A twin probe, Voyager 2, saw the same thing in 2007. Last year, Voyager 1 witnessed another exit sign. The number of cosmic rays from interstellar space went up, perhaps because the Sun’s ...

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