A nebula is a cloud of substances and gases that can form into a star. A star is a ball of hydrogen and helium with trace amounts of other gases. A supernova is the death of a star.
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Yes, a nebula is far larger than a neutron star. A neutron star is a few miles across. A nebula is light years across.
The Sun is a star, specifically a G-type main-sequence star, which is the star at the center of our solar system. It is not a planet or a nebula.
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Star formation starts in a nebula.
The sun is a star, not a planet or a nebula. It is a giant ball of gas that emits light and heat due to nuclear fusion reactions happening in its core.