Protostar


 * Protostar**

A protostar is a large object formed by contraction of the gas of a giant molecular cloud in the inter seller medium. For a one solar-mass star this lasts up to 100,000 years. It starts with a core of density and ends with the formation T Tauri wind, a type of super solar wind that marks the change from star accreting to radiating energy. Obsrevations have revealed that giant molocular clouds are approximately in a state of viral equilibrium. The gravitational blinding energy of the cloud is balanced by the thermal pressure of the cloud's constituent molecules and dust particles.