Show SCIENTISTS CHIRR STUDY PROBLEM OF WHY COMETS UA HAVE Vf TAILS JoS Ios ANGELES May I 2 Why Wh Why do I comets have ae tails i is f. one of ot th the captivating problems to bo be discussed by astronomers who who will gather here next August Augu t for tor a session lon of or the International Association for Solar Research These scientists will represent nearly all nations na na- na- na and it will nl bo be th their ir first fht meeting since Ince the assembly at Moudon France Frane 1907 Tho The session pension wilt will be he held at the Carne Carnegie Car- Car ne negie l observatory on Mount 1 Wilson and the a astronomers astronomer may remain there for a period of months Comet tails tall are said Raid to be he- produced b by bya a a. force of repulsion Inherent nt in tho the sun flun That I is the starling starting point in the lem lemA Rut But ul the tho scientists want to satisfy them themselves ches whether these thue brilliant nt appendages ap- ap an arl th the result of the tho pressure o of ot the suns Buns un light ou or whether the they are aro of or electric origin or produced by or or- other ra rays 8 Another of oC the th problems Is to measure the d degree gree of variation In tho the amount of or heat and light energy the sun aun pours into the earth dally daily A Astronomers no longer regard tho time sun nun as 38 a solar sol constant and ono of or of or the forthcoming ing lag meeting Is to to ascertain as nearly nearl as possible the relations of or sun spots to the tho variability of ot sun energy Among lAmong the scientists who are expected to como come are arc Professor Hartmann director of oC the observatory at Gottingen Germany Gormany Professor Professor Pro Pro- fessor of Bonn Donn and Sir Sit David GUI former chi chief cr of the Ute observatory at Cape of Good Hope |