Constraints placed on the nature of chondrule precursors

The melting conditions and cooling rates experienced by chondrules have been experimentally investigated and reviewed. A discussion of experiments that have studied the nature of chondrule precursors and what constraints these experiments have placed on chondrule precursors is presented. Topics discussed include the following: (1) physical characteristics of starting compositions; (2) chemical characteristics of starting compositions; and (3) constraints on chondrule precursors.