VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Deep time. Conceptual image of a grandfather clock in space, against a background of stars and a nebula (upper left) and a galaxy (lower right). This image can represent deep time, which is the vast expanse of time represented by the age of the Earth (4.5 billion years) and the universe (14 billion years) when compared to modern human timescales (centuries and millennia).
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