Protoplanetary Disks Gas Giants Protoplanetary Discs Rocky Planets Core Accretion Water Vapor Brown Dwarfs Simulation Terrestrial Planets Disk Instability Circumplanetary Disks Accretion Theory Cold Jupiter Primordial Nebula Exoplanets Research Models Observational Evidence Cosmic Dust Stellar Characteristics Planetary Migration Stellar Evolution Migration Processes Migration Mechanisms Observational Astronomy Exoplanet Dynamics Gas Disks Planet-Forming Disk Planet-Forming Disks Theories Shape of Young Planets Shape of Planets Disc Instability Supercomputer Simulations Observations of Young Planets Disc Fragmentation Disc-Instability Theory Protoplanet Shape Gas Giant Planets Observations Water Vapour Protoplanetary Disk Baby Planets Water Influence Chemical Composition Planetary Systems Disc Observation Planet Composition Research Tools Disk Winds Disk Evolution Disk Dispersal Mechanisms Young Stars Planet-Forming Discs Star-Forming Regions Earth-like Planets Planetary Evolution Giant Planets Star Systems Accretion Processes Star Formation Challenges in Explanation Stellar Formation Low-Density Planets Radial Velocity Measurements Rogue Planets Giant Stars Disk Chemistry Asteroid Collision Dust Grains Sulfur Influence Sulfur Metal Content Models