The dream of every astronomer is to discover a new planet. Previously, this happened rarely: one or two per century. But lately, planets have been discovered frequently: about one large planet per week, and hundreds of small ones per night! The book talks about how the search for large and small planets in the Solar System and far from it was and is being carried out, what technology is used for this, what helps and what hinders astronomers in this work. It is told how planets are named and what discoveries lie ahead. The appendix provides accurate data about the planets, constellations and the largest telescopes. The book is intended for high school students, teachers and students, as well as all astronomy lovers.