![]() ![]() These can't really be terraformed, and are also bigger than ice giants. Gas giants such as Jupiter or Saturn, composed of 90% hydrogen, do have a solid core, but it consists of metallic hydrogen, which can only exist at extremely high pressures - if the atmosphere was lost, the core and the liquified gases surrounding it would evaporate. For this, the gas giant would have to have a lot of oxygen, which not many seem to do. The central and densest part of the ring is inhabited, but there is no gravity. This is a ring of gas in orbit around a neutron star, formed by a gas giant which went too close to the star and lost its atmosphere. ![]() Larry Niven's book The Integral Trees is set in the "Smoke Ring". For "ice giants" like Uranus or Neptune, yes. ![]()
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