A Meter Size Barrier or One Meter Barrier is a size-limiting
factor to the development of planets beyond the order of a meter
in size. Some consider this a category including multiple
types of barriers, since a number appear to bar growth beyond
sizes ranging from a centimeter to a few meters. Some of them:
- Bouncing Barrier - while specs of Cosmic Dust might stick together when they meet, after a certain size, they seem more likely to bounce off each other.
- Radial Drift Barrier - the interaction of objects within a Protoplanetary Disk causes inward migration. At an optimum size for migration, which is on the order of a meter diameter, all would seem to migrate into the star.
- Fragmentation Barrier - collisions between the forming planets would be violent enough to break them apart.
Kilometer Size Barrier