JOE TUCCIARONE / SCIENCE PHOTO LIBRARY JOE TUCCIARONE / SCIENCE PHOTO LIBRARY
Death of the Sun. Artwork of the Sun forming a planetary nebula 5 billion years from now. Ejected gas (purple) is expanding towards the lifeless Earth (lower right) and Moon (lower left) from the dying Sun (upper centre). This stage in the life of the Sun follows its expansion during its red giant stage. When its nuclear fuel has been used up, its outer layers are ejected in this way. The remnant cools to forms a white dwarf star.
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