Astrophysics (index)about

kilometer size barrier

(a barrier to accretion on the order of a kilometer diameter)

The kilometer size barrier is a term given to a barrier on planet formation beyond a size of on the order of a kilometer in diameter. Planet-formation theories attempt to explain their development from collections of dust into larger and larger bodies, to asteroid or planet size. Multiple problems remain in current explanations of such a phenomenon, some of the individual problems identified by the size of the object for which further growth seems impeded.

The kilometer size barrier is specifically: at (very) roughly a kilometer in diameter, there are expected to be planetesimal collisions with sufficiently high relative velocity that their material would be scattered, setting back the process and placing a limit on the growth.

Other "barriers" include the "charging barrier", the "bouncing barrier", and the meter size barrier.

The kilometer size barrier was theorized in 2009 by Ida et al.

(planet formation,barrier)

Referenced by:
planet formation