Research & Reviews : Journal of Space Science & Technology
Volume 8, Issue 1 (2019)
Published
Table of contents
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Do Dark Galaxies Exist in the Universe?
Abstract: As huge islands of stars, gas and dust that populate the universe in groups and clusters. But the theory has predicted that some galaxies, called “dark galaxies,” have few if any stars and are made predominately of dense gas and dark matter. Because they are devoid of stars, dark galaxies have been impossible to detect directly by optical telescope until now. Some theoretical models predicted that dark galaxies were common …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 8, Issue 1, 2019 · pp. 1–3 Read article
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Light Curve Analysis for Different Artificial Space Objects
Abstract: This research deals with the studying of the temporal variations of brightness “light curves” for different space objects. Mathematical expressions describing the light reflection from the satellite components have been established. The computations are applied to different space objects and artificial satellites with various geometries and altitudes. Data precise of artificial satellites are utilized to estimate the obtained results. Keywords: Analysis, brightness, reflection model, various satellite geometriesCite this ArticleAfaf M. …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 8, Issue 1, 2019 · pp. 10–14 Read article
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The Fate of Our Universe: How This Universe Will End
Abstract: There are two ultimate questions for human beings: “where do we come from?” and “where are we going?”. For a long time, they have been topics of just religion and philosophy. But in the last three decades, along with the rapid development of modern cosmology, scientists have already obtained some important clues to these two questions. To explain the origin of the Universe, cosmologists have established a standard theoretical framework: …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 8, Issue 1, 2019 · pp. 15–27 Read article
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The time interval in moving frames can be negative
Abstract: With respect two each other in the moving frame two time interval between and minus the result will be another time interval in moving frame. Therefore In particular case will be, for which the time interval will be negative. Here, is the relativity time, is the rest time interval. This equation is Einstein’s time dilation equation And since, Where, is a time interval in moving frame. This time interval can …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 8, Issue 1, 2019 · pp. 28–31 Read article
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Estimation of Stratospheric Ozone Concentration over Southern Nigeria using Neural Network: Case Study of Lagos and Port Harcourt
Abstract: The neural network model was developed to estimate the stratospheric ozone concentrations along with some meteorological parameters. The neural network was trained using monthly maximum data provided by Nigerian Meteorological Agency (NIMET) and National Aeronautics and Space Administration (NASA) over a period of 43year (1970-2012) in the towns of Lagos and Port Harcourt Ozone concentration from the two stations was estimated using a surface meteorological variable as predictors for the …
Published in Research & Reviews : Journal of Space Science & Technology · Vol. 8, Issue 1, 2019 · pp. 4–9 Read article