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Article Contents

TITLE PAGE

1.INTRODUCTION

2.COSMOLOGICAL DISTANCE AND TIME

3.GROWTH OF STRUCTURE IN THE BIG BANG COSMOLOGY

3.1.The Cosmic Microwave Background

3.2.Density Inhomogeneities in the Early Universe

3.3.Non-Baryonic Dark Matter

4.PROPERTIES OF PGs

4.1.Surface Density

4.2.Angular Size

4.3.Luminosity

4.4.Spectral Energy Distribution

5.SEARCHES FOR PGs - AN HISTORICAL OVERVIEW

5.1.Optical Continuum and Emission-Line Searches

5.2.The Era of the Near-Infrared

5.3.Masquerading PGs

6.EVIDENCE FOR TYPE-DEPENDENT EVOLUTION OF GALAXIES

6.1.The Lyman Dropouts

6.2.The Age of Elliptical Galaxies

7.DUSTY ELLIPTICAL PGs

8.CONCLUDING REMARKS AND FUTURE PROSPECTS

REFERENCES