Show PLANTS MADE BY SPIRALS original nebula supposed to have been formed influence of the sun how were the planets made prof G moulton ol 01 the university of chicago has another alternative to la place s theory of the formation of the planetary systems it Is that the planets and their satellites have been formed around primitive nuclei of con sid erable dimensions existing in spiral nebulae probably similar to those which prof keeler showed to be many times more numerous than all the neb alae of all other types the growth of each nucleus was caused by the gradual accretion of smaller masses and the method of this growth which Is suggested accounts tor all the dif ferent types of bodies now found in the solar system and tor their pres ent motions and velocities on bynam leal principles the original spiral nebula Is supposed to have beer formed by the near approach ol 01 an other star to the body which is now our sun this exterior attraction se up tides in the eolar matter and be ing continued actually caused am mense masses to be ejected and drawn out in the spiral form on this as the spiral would emerge from the central nucleus in two directions on opposite sides and this Is the form generally shown in photographs ol 01 such nebulae |