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In order to make you study physics and astronomy with initiative and interest, we tried to present the material in the most accessible way. In the text, we have provided not only scientific facts, various theories and explanations to them, but also answers to problematic questions, descriptions of natural phenomena and technological processes. So we hope that this textbook will encourage you to compare and contrast information, analyse it, and explain it.

It should be noted that this textbook is not the only source of information. Therefore, when preparing for lessons and research projects, you need to learn how to work with different sources of information, be able to evaluate and analyse the reliability and validity of sources, and process, compare, and contrast materials.