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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.