Why are comets visible to the naked eye, although the size of their nuclei is usually only a few kilometers, while asteroids

Why are comets visible to the naked eye, although the size of their nuclei is usually only a few kilometers, while asteroids, which are much larger, are inaccessible to the naked eye?

Asteroids only reflect sunlight, while comets exhibit fluorescence. The main contribution to the luminosity of comets is made not by the nucleus, but by the head and tail.

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