a moon of Jupiter that is volcanically active, contributes a significant amount of charged particles to Jupiter's magnetosphere.
These charged particles can spiral along the planetary magnetic field lines into the upper atmosphere and around the magnetic poles. High-energy electrons and ions (with energies up to tens of mega-electron-volts) are ejected from Jupiter's magnetosphere and can reach Earth's orbit. These streams change with the planet's rotational period like radio emissions and are extremely collimated. The unrelenting action of these solar particles, which screen humans from the Sun's UV radiation, could deplete the Earth of its protective layers if the magnetosphere weren't present. It seems obvious that the development of Earth into a habitable planet was greatly aided by this magnetic bubble. There is a vast ocean of liquid metallic hydrogen deep beneath Jupiter's clouds. Hydrogen is often a gas on Earth. However, the pressure inside Jupiter's atmosphere is so high that the gas turns into liquid.
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