World-life; or, Comparative geology . ^ A and C, andtakes a course betweenthe two attractions to , C is attracted byA and B, and arrives ata at the same instantwhen, by hypothesis, Aand B arrive at the samepoint. It is evident that there will be ilo tangential re-sultant, and no rotation will ensue; but the united masswill undergo a translation in space, in the direction of theresultant of three momenta. (2.) Second Case.—The centres of gravity move towarda coinmon point icith such velocities as to ^:>«ss it succes-sively. The nebula A is attracted by B and by C ( The last f
World-life; or, Comparative geology . ^ A and C, andtakes a course betweenthe two attractions to , C is attracted byA and B, and arrives ata at the same instantwhen, by hypothesis, Aand B arrive at the samepoint. It is evident that there will be ilo tangential re-sultant, and no rotation will ensue; but the united masswill undergo a translation in space, in the direction of theresultant of three momenta. (2.) Second Case.—The centres of gravity move towarda coinmon point icith such velocities as to ^:>«ss it succes-sively. The nebula A is attracted by B and by C ( The last figure also illustrates this case, supposing. Figure 20. ^[otiox of Three Xebvl^IN Space. Case I, Sub-case b. NEBULAR ROTATTOK. 97 the three bodies to reach a successively). B is also at-tracted by C, but owing to relative positions and masses(as we may assume) is less affected by C than A is. Aand B both move toward a, but A will reach the point, letus suppose, a little before B. It will be struck by Btherefore, tangentially, and both nebulous masses, at leastupon their exterior, will acquire a rotation in the samedirection. If thedeflecting force ex-erted by C is suchthat A and B ap-proach each otherto a distance butlittle less than thesum of their radii,they will not co-alesce unless theirvelocities are low,but will each ac-quire a rotary mo-tion, and each passon maintaining aseparate if their cen-tres of gravity ap-proach within adistance sufficient-ly less, than the sum of their radii, the two nebulae willcoalesce. Until completely coalesced, they will presentthe form of a dumb-bell, and afterward, of an irregu
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherchica, bookyear1883
