World-life; or, Comparative geology . 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 existence.But if their cen-tres of gravity ap-proach within adistance suffi

World-life; or, Comparative geology . 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 existence.But if their cen-tres of gravity ap-proach within adistance suffi Stock Photo
Preview

Image details

Contributor:

The Reading Room / Alamy Stock Photo

Image ID:

2AWG2NN

File size:

7.1 MB (128.1 KB Compressed download)

Releases:

Model - no | Property - noDo I need a release?

Dimensions:

1405 x 1778 px | 23.8 x 30.1 cm | 9.4 x 11.9 inches | 150dpi

More information:

This image is a public domain image, which means either that copyright has expired in the image or the copyright holder has waived their copyright. Alamy charges you a fee for access to the high resolution copy of the image.

This image could have imperfections as it’s either historical or reportage.

World-life; or, Comparative geology . 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 existence.But 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 irregularspiral, whose irregularity will continually diminish asthe coalescence proceeds. In this way, forms like H1, 173 and H 1, 622 (Fig. 8) would be evolved. It is quite conceivable that nebular rotation might begenerated by attraction, in cases where no actual impact7. Pig 21. Motion of Three Nebul.b in Space.Case II. 98 NEBULAR LIFE. takes place. Suppose an amorphous nebula A (Fig. 22) tobe so situated in respect to B, that its longer diametera h, makes an oblique angle with the line A B, joining thecentres of gravity of the two nebulae. One extremity ofthe mass, as at b^ will experience a greater relative attrac-tion toward B than the other extremity of the mass will experience; and thisinequality will con-tinue as long as theangle B A 6 is not aright angle, and, inthe case supposed, aslong as B A ^ is lessthan a right angle.The effect must be toturn the nebula A insuch direction that itslonger diameter pro-duced will tend topass through the cen-tre of gravity of B.But in the meantime, B and A may havetravelled to widelyseparated regions ofspace. The rotationbegun in A will there-fore Continue unhin-dered. It will continue in any case where the hinderingaction of B is less than the action which inaugurated thero

Save up to 70% with our image packs

Pre-pay for multiple images and download on demand.

View discounts