Although the solid nucleus of comets is generally less than 60 kilometres (37 mi) across, the coma may be thousands or millions of kilometres across, sometimes becoming larger than the Sun.
雖然固體的彗核一般都小於60公里（37英里）的直徑，但彗髮可能有數千或數百萬公里的直徑，有時會變得比太陽還要大。