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Introduction

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Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUH, volume 1)

Abstract

Observations in the invisible regions of the spectrum have become more common in astronomy during the last 20 years. After radio-astronomy, astronomy of ultraviolet, X- and γ-rays appeared. X- and γ-astronomy are still only beginning to develop, even now they give important information which cannot be obtained with former methods. High-energy quanta are produced with high-energy electrons. Therefore X-rays are the emission of high-speed particles which reveal themselves weakly in the other part of the spectrum.

Copyright information

© I.A.U. 1968

Authors and Affiliations

  1. 1.Sternberg Astronomical ObservatoryMoscowU.S.S.R.

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