Introduction to Astronomy: For the Use of Science Classes and Elementary and Middle Class Schools

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G. P. Putnam's sons, 1873 - Astronomy - 174 pages
 

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Page 54 - that every particle of matter in the universe attracts every other particle, with a force whose direction is that of the line joining the two, and whose magnitude is directly as the product of their masses, and inversely as the square of their distances from each other.

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