Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 283
move in elUpseswith varjdng degrees of elongation; many comets move inorbits which are sensible parabolas; and there may possiblybe comets which move in hyperbolas. 149. The Question of other Laws of Force. — Manyother laws of force than that of the inverse squares areconceivable. For example, the… … Fig. 89. — Different conies dependingon the initial velocity. CH. VIII, 150] THE SOLAR SYSTEM 237 er It is found that, if the force varied according to any oth„power of the distance than the inverse square, except directlyas the first power, then (save in special initial conditions) theorbits would…
Astronomy
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