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Stars are giant, luminous spheres of plasma, they are born from a cloud of gas and dust called a nebula. As the nebula gains mass, its gravitational forces build. When they are strong enough to cause the inner part of the cloud to heat up, it becomes a protostar.
Finally, a special moment happens when the core heats up enough to cause the nuclear fusion of hydrogen into helium. When fusion occurs, a star is born. Sometimes, more than one star is born from a nebula that breaks apart and creates a binary system. Most stars are part of a two- or three-star system (unlike our sun, which is a lonely, single star).
Stars have a life cycle of birth and death. Smaller stars live longer since they burn their fuel more slowly. Massive stars have shorter life cycles because they run out of hydrogen much quicker than the smaller ones.
Massive stars have shorter life cycles because they run out of hydrogen much quicker than the smaller ones. The color of a star indicates how hot it is. Red stars have the lowest temperatures followed by yellow stars.
White and blue stars have the highest temperatures.