Protostars

=== Now the stages of a protostar. Fragments from a molecular clouds core won’t just turn into protostars, they first will start to separate and brake free from the other parts of the clouds core. As they separate, each fragment will have its own individual gravity and identity. ===

===   This is known as the beginning of a protostar. There are three stages in which a protostar will undergo before it forms into a complete star. First, any loose gas will fall into the centre. The gas that falls will release kinetic energy in the form of heat. This will make the temperature and pressure of the protostars centre increase. As it becomes denser, it starts to trap infer-red radiation causing it to rise in temperature and pressure even faster. When the pressure is high enough, it will stop the collection of in falling gas. At this stage it is now a stable protostar. After another few million years this protostar will eventually grow into a full star. === ^

Above is a diagram on the formation of a protostar - courtesy

 * http://abyss.uoregon.edu/~js/ast122/lectures/lec13.html