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In this overview of our current knowledge about the universe a theoretical cosmologist discusses questions that have puzzled thinkers throughout history and the ways in which modern scientists have tried to answer them. He explains how astronomical observations and remarkable deductions have allowed us not only to look back 13.8 billion years to the origins of the universe but also to develop competing theories about its ultimate fate, either in a calamitous ‘Big Crunch’ or a gentler ‘Heat Death’.

The Doctor's universe is rich with ingenious ideas and impossible but nevertheless plausible technology, not least his dimension-defying TARDIS. This companion to the series explores what makes the aliens and monsters tick as well as how the gadgets might work.