Sky surveys and deep fields of ground-based and space telescopes
Selected results obtained in major observational sky
surveys (DSS, 2MASS, 2dF, SDSS) and deep field observations (HDF, GOODS, UHDF, etc.) are reviewed. Modern
surveys provide information on the characteristics and space
distribution of millions of galaxies. Deep fields allow one to
study galaxies at the stage of formation and to trace their
evolution over billions of years. The wealth of observational
data is altering the face of modern astronomy: the formulation
of problems and their solutions are changing and all the previous
knowledge, from planetary studies in the solar system to the
most distant galaxies and quasars, is being revised.