| http://www.w3.org/ns/prov#value | - meters [1,14], we can obtain the values of tn from expression (2), i.e., estimate the times at which the primary rings were formed (tn??? tp.r): (4) where m and V are the mass and volume of the protoplanetary disk, s and M are the average diameter and molecular mass of the diffusing particles, g is a constant (g =6), T is the absolute temperature, and R is the universal gas constant.
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