Planetary formation is still an active area of research, as there are many unanswered questions about the process. However, scientists have developed theoretical models and observations that suggest planets are formed from the gas and dust in protoplanetary disks around young stars. These disks are made up of gas and dust particles that are constantly colliding and sticking together, forming larger and larger particles. As these particles grow larger, they start to experience additional forces, such as drag and gravitational attraction, that cause them to spiral towards the center of the disk. Eventually, these particles can grow into planetesimals, which are small, rocky or icy bodies that are several kilometers in size. Over time, these planetesimals can collide and merge, forming ever-larger bodies until they become full-fledged planets. The exact process and timeline of planetary formation depend on a variety of factors, including the composition and density of the protoplanetary disk, as well as the distance from the star.