What critical observation about comet visibility confirms that the brightest objects are not necessarily the largest?

Answer

The rate of sublimation and presence of dust

Brightness depends heavily on how rapidly volatile material sublimates; a comet with highly volatile material near the surface brightens quickly, while one covered by a non-volatile crust might remain dim even close to the Sun.

What critical observation about comet visibility confirms that the brightest objects are not necessarily the largest?

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