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. These large, swelling stars are known as red giants.

The meaning of star is a natural luminous body visible in the sky especially at night. How to use star in a sentence. A star is a luminous spheroid of plasma held together by self-gravity. [1] the nearest star to earth is the sun. Many other stars are visible to the naked eye at night; Their immense distances from earth …

Many other stars are visible to the naked eye at night; Their immense distances from earth …