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Protostar, illustration. A protostar is a star in the process of formation. They are created when a globule a dusty and gaseous nebula condenses under gravity. The globule acts as a cocoon. Because of this, protostars are generally invisible to the universe at large, except at infrared wavelengths. Protostars may be flattened out by rapid rotation, and are probably surrounded by a vast disc of gas and dust, around which planets will one day form.