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FIZIKA A 19 (2010) 4 , 263-272
 
MOTION OF DISTANT OBJECTS IN THE UNIVERSE
A. ILAKOVAC and K. ILAKOVAC
Physics Department, Faculty of Science and Mathematics,
University of Zagreb, HR-10000 Zagreb, Croatia
Received 9 November 2010; Accepted 2 February 2011
Online 21 May 2011
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.
PACS numbers: 98.62.Py, 98.80.Es
UDC 524.822
Keywords: simple theory of cosmic expansion, models of cosmic scale function,
velocity-distance relation
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