Why do we think that planets in our Solar System were not formed out of the gaseous disk by direct gravitational 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 support prevented the disk from gravitational collapse. The gravity of the forming planets was not enough to accrete gas.
Why do we think that planets in our Solar System were not formed out of the gaseous disk by direct gravitational 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 support prevented the disk from gravitational collapse. The gravity of the forming planets was not enough to accrete gas.
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Transcribed Image Text:Why do we think that planets in our Solar System were not formed out of the gaseous disk by direct
gravitational 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 support
prevented the disk from gravitational collapse.
The gravity of the forming planets was not enough to accrete gas.
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