Show Planetary r tt System That's V 1 s Twin of or Our Own Swings in Tp Outer ter Space Astronomer Says T. T r rs' rs i s' s Noted Dutch Scientist Be Be- 1 t 7 Haves Neves Both Formed by byi i J. J Suns Colliding if f By F. F B. B COLTON Associated Press Science Writer WASHINGTON Noy 20 O An P An Another An Another other planetary planetary system a s' s sort rt of twin of the system to which the earth belongs probably Is la whirling whirring about some sun nun far away In outers outer Willem DeSitter De DeSitter Professor space s ace says Sitter noted Dutch astronomer In a n report to the Washington Academy of Science he states that both systems must have havo been born In similar fashion when one speeding speeding speed speed- ing sun sideswiped another millions mil mil- tons lions of years ago on the broad brond traffic traffic fic tic lanes Janes among the stars A sun Bun from outer space pace scraped fenders with our own sun nun in the distant past and the debris that flew off formed the earth and other planets Professor D Do Dc Sitter holds ONLY ONE OTHER There is a one to probability that the tho sun would sideswipe another sun during its lifetime of ofa ofa a million ye years rs De a Sitter h hc has c calculated This ratio of frequency would Indicate Indicate In In- In- In that only about one other such Buch collision coUlston could have occurred he said Bald tending to show there is only one ono other planetary system like that of which the earth is in a aTo part PaIt To Professor Do Sitter a 8 sideswIping side side- sideswiping swIping collision however Is Is the only satisfactory way of explaining how the the p planets ts originated It also explains he says saB why the planets nearest tho the sun arc are small email those at a greater distance are larger and those still aWl farther away become become become be be- come small smaIl again HOUR FIVE COLLISION The sun that collided with our own sun Bun might have been rushing at n a speed d of between SO M and and miles miles' milesa a second Our own own sUD sun is about one million times the size of oC the earth Probably the thee other sun sun was fully tuny as large The collision Professor De Do Sitter estimates lasted from two tv to five hours In his theory the Impact of the collision started our sun suu ro rotating rotating rotating ro- ro tating from west to east the di direction direction direction di- di it still sun follows An oval- oval shaped mass of or matter was drawn out from the sun by the other suns sun's attraction n and thrown In the me same direction as the spin of the sun The Th large center of the oval broke up into large fragments De Sitter says and the tapering ends formed the smaller planets nearest to to the farthest from tram the theun sun un r ALL GAS AT FIRST FIRST- At At first all the planets are arebe believed be- be to have been masses of hot gas following a very elliptical path around round the sun The small email planets cooled most moat quickly kly and became liquid When they p passed ed the point nearest nearest nearest near near- est the sun on their first trip around I it they already were coo cool enough so that the tho suns sun's attraction could pull little or no matter off from them That at is why says n 8 De Je Sitter the tho small planets have bavo few or no no satellites or moons I The larger planets cooling more slowly still were gaseous as they I came near the sun on their first swing around The suns Buns attraction attraction attraction tion was was' able to pull more mor matter off from them and for this reason the large arge planets says says' De Sitter have the most satellites |