According to early models based on the Solar System, where was the required location for large, gaseous giants to form?

Answer

Far from their host stars, beyond a boundary known as the "snow line" or "ice line".

The models dictated that gas giants needed to form past the snow line, where water and methane could condense into solid ice grains, supplying the abundant material necessary for rapid core accumulation.

According to early models based on the Solar System, where was the required location for large, gaseous giants to form?
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