Astrophysics (Index)About

kilometer size barrier

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

The term kilometer size barrier is used for barriers to the growth of planets beyond some general size on the order of a kilometer in diameter. The term has been used for mechanisms that would seem to affect planetary embryos in that size regime.

One such mechanism of interest is that turbulence in the protoplanetary disk might result in too many collisions of sufficiently velocity that embryos would lose mass rather than gain it.

(planet formation,barrier)
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