Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 472
ds of milhons of stars in theheavens and they are moving with respect to one another withan average velocity of about 600,000,000 miles per year.While their motions are by no means entirely at random, yetthere are milHons of themmoving in essentiallyevery direction. It is in-evitable that in the… … nebula. If they should Fig. 156.—Deflection of ejected material. by a passing star. simply pass near one an-other without striking, an event which would occur manytimes more frequently than a collision, a spiral nebula wouldprobably be formed, as will now be shown. Consider two stars passing near…
Astronomy
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