Only about three comets per year plunge into the Sun and are destroyed.

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Many more than three comets per year, often several hundred, are believed to plunge into the Sun or disintegrate in its outer atmosphere. These are mostly small comets that are not visible from Earth without the aid of a telescope. The SOHO (Solar and Heliospheric Observatory) satellite, for example, has observed thousands of such small comets, referred to as "sungrazers," since its launch.

Only About Three Comets Per Year Plunge into the Sun