Why Hasn't the Kuiper Belt and Scattered Disc Coalesced into a Planet?

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SUMMARY

The Kuiper Belt and Scattered Disc will not coalesce into a planet due to high eccentricities that prevent low-velocity collisions. Instead of accumulating material, collisions in these regions grind down existing bodies. The slow movement of objects combined with the vast volume of space further reduces the likelihood of collisions, solidifying the conclusion that planet formation in these areas is not feasible.

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  • Understanding of celestial mechanics
  • Familiarity with the Kuiper Belt and Scattered Disc
  • Knowledge of collision dynamics in astrophysics
  • Basic concepts of planetary formation
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  • Research the dynamics of high eccentricity orbits
  • Explore the role of collisions in planetary formation
  • Study the characteristics of the Kuiper Belt and Scattered Disc
  • Investigate the slow movement of celestial bodies in space
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Astronomers, astrophysicists, and students of planetary science will benefit from this discussion, particularly those interested in the dynamics of celestial bodies and planetary formation processes.

FeynmanMH42
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Why has this not coalesced yet to form a planet?
 
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It never will. Eccentricities are too high, so any collisions would not be low-velocity. Collisions will grind things down instead of build them up. They also move very slowly, and the volume of space out there is huge, so collisions are not even that likely.
 

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