Reason Why

Does one planet really matter among the immensity of the Cosmos? John Gribbin is here to persuade us that it does. In this ground-breaking and provocative new book Gribbin argues that we owe our existence to the impact of a ''supercomet'' with Venus 600 million years ago. But this is only part of the story, just one of the astronomical and geophysical reasons why the Earth is special. For the firs...