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Gas giant or ice giant? A gas giant planet is predominantly hydrogen and helium. An ice giant, predominantly what astronomers call "ices", such as water, CO2, CH4, NH3 and others. On Earth, those are liquids or gases, but in space, when a solar-system is forming and beyond the frost line, they're usually frozen as ices. As you stated, Gas giants, ...


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The planets do not orbit in the same plane as the Earth, they are inclined by a few degrees. This means that as they orbit the sun, they are sometimes above the plane of the Earth's orbit and sometimes below. And it takes one orbital period to go the full cycle from above, to below and back to the start. The reason that they appear further from the ecliptic ...


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