VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Death of the universe. Conceptual image of a human skull on a starry background, representing the end of the universe. There are several theories concerning the ultimate fate of the universe, whether it will end and how. These theories range from the heat death of the universe (when entropy increases to a maximum), to a 'Big Rip' scenario where the expansion of the universe accelerates, to a 'Big Crunch' where the expansion of the universe slows and reverses as all space and matter contracts to form a new singularity.
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