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The extragalactic universe, the immense world of a billion galaxies
lying beyond out own, is the subject of this book. Our Sun is but a
tiny star among a hundred billion other in our Galaxy, the Milky
Way, which appears as a luminous veil trailing across the clear
night sky. Beyond the Milky Way we will soar into space amid
galaxies, clusters of galaxies, radio galaxies and quasars of
enormous energy, out to the cosmological horizon which arrests our
flight like an intangible barrier. Why do galaxies seem to fly from
us? Is space so strongly curved that by going straight ahead we
come up behind ourselves? Did it all begin with an enormous
explosion, the famous Big Bang, which decided our fate in the first
quarter of an hour? These are the questions which this rigourous
and enthusiastic scientist tries to answer with complete honesty
and non-technical clarity.
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