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Show M COITS SSWILo Astronomers Are to Ask Themselves the Question Los Angeles, May 2. Why do comets com-ets have talis, is one of the captivating captivat-ing problems to be discussed by astronomers as-tronomers who will gather hero next August for a session of the International Interna-tional Association for Solar Research These scientists will represent nearly all nations, and it will be their first meeting since the assembly at Men-don, Men-don, France, In 1907. The session will be held at the Carnegie Car-negie observatory, on Mount Wilson, and the astronomers may remain there for a period of months Comet tails are said to be produced by a force of repulsion inherent in tho sun. That is the starting point in the problem. But the scientists want to satisfy themselves whether those brilliant bril-liant appendages are tho result of the pressure of the sun's light or whether they are of electric oriein, or produced produc-ed by cathodlc or other rays. Another of the problems Is to measure meas-ure the degree of variation in the amount of heat and light energy tho sun I'ours into the earth dally. Astronomers As-tronomers no longer regard the sun as a "solar constaut," and one of the purposes of the forthcoming meeting Is to ascertain as nearly as possible the relations of sun spots to the variability vari-ability of sun energy. Among tho j scientists who are expected to come are Prof. Hartmnnn, director of the observatory at Gotvlngen. Germany; Prof. Kays'er, of Bonn, and Sir David Gill, former chief of the observatory at Capo of Good Hope. |