According to NASA, stars form in clouds of dust dispersed throughout various galaxies. A specific example of this is the Orion Nebula. In the clouds, the gas and dust collapse under their own gravitational force and the material located at their center begins to heat up. Most of this material is formed into a star while remains are dust, gas, asteroids, or other objects. According to the Discovery Channel’s program “Curiosity” stars form in the same way. The gas and dust collapse to form a protostar which collects more and more mass and gets hotter and hotter until finally, fusion occurs and a star is formed. Mainly all of the reliable sources follow the same theory: That clouds of gas and dust collapse to form protostars, which then gain mass and temperature until an actual main sequence star is formed.