When the interstellar gas and dust of a nebula condense, a protostar is formed that emits jets of matter. This continues to condense by gravitation while it heats up. When the temperature of the proto-star core reaches 10 million degrees, a series of nuclear reactions begins and a new star is born. Later, the star's crust undergoes an expansion accompanied by warming, which results in the formation of a red giant, 10 to 100 times the diameter of the Sun. If the red giant is very large, it produces iron and other elements heavy, increases in size and becomes supergiant. Then it explodes and releases matter in space. If only the outer part explodes and the core has enough mass, it becomes a black hole.
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