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    Naturevolume 120page24 (1927) | Download Citation



    COMET PONS-WINNECKE.—Recent observations, both visual and photographic, indicate a very definite central condensation, 10″ in diameter or less, permitting accurate, measures to be made. According to usual views of comets, this indicates a well-defined meteoric cluster, not exceeding 250 miles in diameter. It is rather a puzzle how they have maintained this compact regular formation through at least 108 years, in view of repeated large perturbations by Jupiter. It suggests that some force other than gravitation may help to keep the constituents together.

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