A gas torus is the setting for Larry Niven's novels The Integral Trees and The Smoke Ring, wherein a gas giant orbiting a neutron star generates a gas torus dense enough for (even human) life; this arrangement is implausible in reality.
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In the Solar System, gas tori usually are produced by the interaction of a satellite's atmosphere with the magnetic field of a planet, most famously the Io plasma torus, which is produced by the ionization of roughly 1 ton per second of oxygen and sulfur from the tenuous atmosphere of Jupiter's volcanic moon, Io.
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