The article surveys the present observational status of cosmology. Despite several recent attempts, it is still not possible to decide whether the Universe is in a steady state or whether it has evolved from a much denser configuration. It is pointed out that ratio astronomy will play an important role in cosmology, since radio sources can be detected at distances beyond the reach of the 200-inch telescope.
- 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
- 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie ; 4 - vertebres: systeme nerveux et organes des sens