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Protostar: A protostar is a giant ball of gass and dust that results from the concentration and spining of the hydrogen gass in a nebula under the forces of gravity. The protostellar phase is an early stage in the process of star formation. For a one solar-mass star it lasts about 100,000 years. As the gass continue to spin faster and faster, it starts heating up as the particles collide between each other more often, under the increased pressure. At the same time the density increase and the gass cloud continue to collapse, releasing gravitational energy. This stage lasts until the temperature in the protostar reaches around 15 000 000 °C, at which point it is possible for a nuclear fusion to occur in the cloud's core.
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