Wilbert Smith Archives Files Box 1130 16 1130-16-p041

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148 external layers, subjected during the comet’s life to a smaller pressure. We can therefore expect that short-period meteors have a greater solidity than long-period ones. Thus, it is easy to understand a difference in density among meteors with much different orbital characteristics, while it is difficult to find reasons for justifying a difference in com- position. We should expect a nonsystematic spread in the values of the density p, among sporadic meteors. Taken together with the...