The nebular hypothesis mysteries solved!

The physics of accretion disks encounters some problems.[14] The most important one is how the material, which is accreted by the protostar, loses its angular momentum. The momentum is probably transported to the outer parts of the disk, but the precise mechanism of this transport is not well understood. The process or processes responsible for the disappearance of the disks are also poorly known.[15][16]

Planetary disks surrounding stars are bunk! They are not necessary!

The formation of planetesimals is the biggest unsolved problem in the Nebular Disk Model. How 1 cm sized particles coalesce into 1 km planetesimals is a mystery. This mechanism appears to be the key to the question as to why some stars have planets, while others have nothing around them, even dust belts.[17]

How 1cm sized particles coalesce into 1km planetesimals is a mystery! You know why?! The time scales at which the entire universe is only theorized to be 13.5 billion! All their theories do not have enough time to explain this!

The formation of giant planets is another unsolved problem. Current theories are unable to explain how their cores can form fast enough to accumulate significant amounts of gas from the quickly disappearing protoplanetary disk.[12][18] The mean lifetime of the disks, which are less than 107 years, appears to be shorter than the time necessary for the core formation.[9]

Another problem of giant planet formation is their migration. Some calculations show that interaction with the disk can cause rapid inward migration, which, if not stopped, results in the planet reaching the "central regions still as a sub-Jovian object."[19]