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nydus/A Short History of the WorldPublic
Page 19 of 773
Table of Contents

I THE WORLD IN SPACE

THE NEBULA SEEN EDGE ON
THE NEBULA SEEN EDGE-ON Note the central core which, through millions of years, is cooling to solidity Photo: G. W. Ritchey

If, then, we represent our earth as a little ball of one inch diameter, the sun would be a big globe nine feet across and 323 yards away, that is

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