Titan outranks Mercury in diameter among solar-system worlds
Titan’s diameter exceeds Mercury’s, so Saturn’s largest moon is physically wider than the innermost planet — a reminder that “moon” does not always mean small.
Thick atmosphere and organic haze make Titan look even larger in some wavelengths, but the solid body alone already beats Mercury’s width. Size ranking mixes planets and satellites on one chart.
Companions can rival planets. Titan proves giant-planet systems host worlds that would steal headlines if they orbited the Sun alone.
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