The outstanding Russian thinker, theorist of space exploration, Konstantin Tsiolkovsky, left an extensive legacy. He turned out to be a real prophet. Both Sergei Korolev and Yuri Gagarin admitted that it was Tsiolkovsky who opened the “path to the stars” for them. For the anniversary of the great genius, we have collected his articles that reveal Tsiolkovsky’s attitude to various spheres of life and science. Many of them have not been published for a long time. This book also contains essays dedicated to the life and work of Tsiolkovsky, written by contemporaries and researchers of the 21st century.