For this reason, the Sun is the hottest and brightest star in the universe. But there are stars in the universe that are bigger than the sun and cannot be seen or known because they are farther away from the earth. Many stars are millions of kilometers away from the solar system. The stars are born and die. That is why the universe is constantly changing.
When the star dies the surrounding cover is lost and only the center remains. This center is part of her womb. It has millions of degrees of heat. Astronomers call such a star a white dwarf or a white dwarf. The warmest white dwarf in the universe is half the size of the sun and 3 times hotter than the sun. It is also thousands of times brighter.
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