Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 540
er,while its motion is controlled by the attraction of the wholemass of stars. It is difficult to realize the great distances which separatethe stars and how feeble are the forces with which theyattract one another. If the earth were at rest, it would falltoward the sun less than one eighth of an… … -Near approach of twostars is similar to an oblique col-lision of elastic bodies. 494 AN INTRODUCTION TO ASTRONOMY [ch. xiii, 279 a velocity of only 0.00007 of an inch per second. Onlyafter 900,000,000 years at the present distance would therelative velocity of the two amount to one mile per…
Astronomy
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