What objects in the solar system have the most gigantic atmospheres?

Comet atmospheres can be larger than all known objects in the solar system, including the sun itself. So, comet Holmes in 1882 had a shell with a diameter of 1.5 million kilometers. Comet Kohouthek in 1973, when passing near the Sun, had an outer shell of hydrogen with a diameter larger than the diameter of the Sun (1.4 million km).

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