Cosmology pp 78-81 | Cite as

Introduction to the Study of the Universe

  • Georgios Contopoulos
  • Dimitrios Kotsakis


The first observation concerning the whole Universe can be made with only one glance at the night sky, without any telescope and with limited theoretical knowledge. At the beginning of the last century, the german astronomer Olbers posed the following question: “Why is the night sky dark?” The answer to this question appears simple at first sight: “because there are not enough stars in the sky and therefore there are gaps between the stars”. This answer is, however, wrong. There are enough stars to fill the sky and actually their total light “should” be sufficiently intense to set fire to the Earth. Let us examine a simple proof of this claim.


Spherical Shell Simple Proof Euclidean Geometry Universal Constant Unit Surface Area 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • Georgios Contopoulos
    • 1
  • Dimitrios Kotsakis
  1. 1.Astronomy Department, PanepistimiopolisUniversity of AthensZografos, AthensGreece

Personalised recommendations