By Johan Grasman

Half A: The Fokker-Planck Equation. half B: Asymptotic answer of the go out challenge. half C: functions

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The intrinsic limiting stellar images of the larger telescopes are in themselves larger than those obtained with the small instruments. While the I8-inch Schmidt produces limiting stellar images 20 microns in diameter, the smallest images on the 48-inch Schmidt plates are at least 25 to 40microns in size because of the interference of chromatic errors. At the same time seeing caused by the unsteadiness of the atmosphere begins to play its fatal role, as it must when the focal length increases. Unless we attempt absolute counts, however, we are still on fairly safe grounds.

As a first approximation to a morphological approach to astronomy we thus propose the following steps: a) An observational campaign, perhaps for a decade, of driving hard towards the closing of some of the most obvious gaps in our knowledge of the material contents of the universe. This includes the types of objects, their distribution in space and their velocities. b) A similar observational campaign to close some of the most obvious gaps in our knowledge of the fundamental physical phenomenena which govern the behaviour ofthe various aggregations of matter in the universe.

5. 2. The mean apparent velocity of recession of the Coma cluster, according to HUMASQN'S measures, is of the order of 7400 km/sec. In the preceding and throughout this book we shall refer to the universal redshift in the spectra of distant galaxies as an apparent velocity of recession. As a quantitative measure of this redshift we shall use the expression (14) 38 II. o is the wave length of the unshifted spectral line, L1 A. is its change in wave length and c is the terrestrial value of the velocity of light.

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