These large, swelling stars are known as red giants. But there are different ways a star’s life can end, and its fate depends on how massive the star is. A star is a luminous spheroid of plasma held together by self-gravity.

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Many other stars are visible to the naked eye at night; Their immense distances … A star is a brilliantly glowing sphere of hot gas whose energy is produced by an internal nuclear fusion process. Stars are contained in galaxies. A galaxy contains not only stars, but clouds of … The amount of material in a star (its mass) is so huge that a nuclear reaction called nuclear fusion goes on inside it. This reaction changes hydrogen to helium and gives off heat.

A galaxy contains not only stars, but clouds of … The amount of material in a star (its mass) is so huge that a nuclear reaction called nuclear fusion goes on inside it. This reaction changes hydrogen to helium and gives off heat.

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