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This book includes the derivation of time like geodesic motion in Kerr-de Sitter space-time. Also, the analysis of the equation of geodesic motion in Kerr-de Sitter space-time has been presented. It is found that the rotational velocity in the flat portion increases with mass and curvature of that rotation curve is dependent on cosmological constant. Here, the values of the mass, cosmological constant and angular momentum per unit mass (Kerr parameter) of different galaxies are estimated assuming the circular motions of the galaxies and their rotational curves. For this, method of...

I present a Study of Relative Flux Density Variation in Saturn's ring using images taken Schmidt Telescope from National Observatory Nagarkot Nepal during the period form November 2008 to January 2010.The images of the Planet Saturn is captured with the help of the interface software AUTOSTAR SUITE 3.08 in FITS format then processed the images in the Software ALADIN2.5.The values of Relative Flux Density of 500*500 total 250,000]pixels are used for the study.I made an attempt to study the Flux Density variation along Saturn's ring form Eastern to Western region.I found that the total flux...