Have you ever wondered what dark matter is or why galaxies collide? Or why the Moon is gradually drifting away from Earth? Space is really, really big, as Douglas Adams once pointed out, and there is no better guide to it than Fred Watson, astronomer to the stars.Fred Watson has taken the many, many questions that have been asked by listeners of his popular, long-running radio shows, and answered them in Why Is Uranus Upside Down?

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