Original scientific paper

Motion of distant objects in the Universe

A. Ilakovac ; Physics Department, Faculty of Science and Mathematics, University of Zagreb, HR-10000 Zagreb, Croatia
K. Ilakovac ; Physics Department, Faculty of Science and Mathematics, University of Zagreb, HR-10000 Zagreb, Croatia

Abstract

We give a brief survey of investigations of the structure of the Universe and of its expansion, for educational purposes. As we know it today, the size of the Universe is immense, enormous numbers of galaxies have been found in it, and in each galaxy enormous numbers of stars. The galaxies move from us at very high speeds, some of the more distant ones at speeds comparable to the velocity of light. Many theories have been developed to explain the vast amount of data that have been obtained by astronomical observations. We give a simplified theory of the cosmic expansion and present results of three models for the cosmic scale function R(t): the constant rate of expansion, the accelerated expansion and the constant Hubble parameter models.

Keywords

simple theory of cosmic expansion; models of cosmic scale function; velocity-distance relation

Hrčak ID:

302806

URI

https://hrcak.srce.hr/302806

Publication date:

1.9.2010.

Article data in other languages: croatian

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