Why do we think that planets in our Solar System were not formed out of the gaseous disk by directgravitational collapse?Planets are formed in disks. Disks rotate too fast to collapse gravitationally to form planets.In disks that are not massive enough, tidal gravity of the central star prevents the disk gas from collapsing.The material in the disk orbits close to the star. This makes the disk too hot, and pressure supportprevented the disk from gravitational collapse.The gravity of the forming planets was not enough to accrete gas.

When the star was in its initial state as the temperature and the density of the material in the…

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