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 star is a luminous spheroid of plasma held together by self-gravity.

Many other stars are visible to the naked eye at night; Their immense distances. Get the latest new jersey news from newark-based star-ledger, nj's largest online newspaper. Get business, sports, entertainment news, view videos, photos and more on nj. com.

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