MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Scale of the Universe. Illustration depicting the scale of the Universe. From lower left are the smallest objects: the fundamental particles, atoms, molecules such as DNA, and cells. Toward upper right the scale expands further: from the Earth itself to the Solar System, the Milky Way galaxy and on to galaxy clusters and the whole Universe. In the middle is our familiar human scale (silhouetted human figure). The range of scale from the smallest distance (Planck length) to the largest (diameter of the Universe), is about 61 orders of magnitude, written as a ten followed by 60 noughts.
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