|Title||The formation of planetary systems|
In 1993, the first extrasolar planet (51 Peg) orbiting another solar type star has been discovered. Since then the number has increased to about 500 as of today. The surprising orbital properties of the newly discovered worlds required a revision of the standard theory of planet formation. In my talk I will discuss the main formation scenarios (sequential accretion vs. gravitational instability) in the context of the whole ensemble of extrasolar planets. The necessity of dynamical evolution of young planets in the disc will be emphasized and new results will be discussed.