The Only Moon With Its Own Northern Lights

vayrin

Every planet with a magnetic field earned it through size and heat—except Ganymede. Despite being just a moon orbiting Jupiter, this frozen giant punches above its weight. Buried beneath 800 kilometers of ice, an ancient liquid iron core generates a protected magnetic shield, creating a striking corridor for dancing auroras. #Ganymede #NorthernLights #SpaceMysteries #Astrophysics #JupiterMoons

Transcript

00:00Every planet in the solar system with a magnetic field earned it through size, through heat,

00:07through a molten core spinning fast enough to generate the field that shields it from the sun.

00:14Ganymede has no right to have one.

00:17It is a moon.

00:19The largest moon in the solar system, larger than Mercury,

00:23but still just a moon orbiting Jupiter 628 million kilometers from the sun.

00:32And yet, buried beneath 800 kilometers of ice, something is moving.

00:39A liquid iron core, small, ancient, barely alive,

00:45generating a magnetic field that punches through Ganymede's icy crust and carves out a protected bubble in space.

00:53Jupiter's own magnetic field surrounds Ganymede completely.

00:57A vast, violent field 20,000 times stronger than Ganymede's.

01:03But inside that bubble, Ganymede's field holds a narrow corridor of protection.

01:09And in that corridor, auroras.

01:13Not on a gas giant.

01:15Not on a rocky planet.

01:17On a moon.

01:19Oval bands of shimmering blue-violet light dancing over a landscape of ancient cracked ice,

01:26generated by the same physics that creates the northern lights on Earth.

01:30Judgan,

01:31Jury's�

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