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人们总说宇宙很大，但是它到底有多大？科学家制定了一项雄心勃勃的计划，要画出一幅完整的宇宙地图。然而在可观测宇宙中，有1700亿个类似银河系的星系，不单这些星系在移动，整个宇宙也并非静止不动，甚至有科学

Horizon: The Truth About Looking Young Plastic surgeon Dr Rozina Ali leaves the operating theatre be

Series Eighteen starts airing on 29 January 2012 with seven episodes (not including the India Spec

Horizon goes behind the scenes at NASA as they countdown to the landing of a 2.5 billion-dollar rove

Horizon goes behind the scenes at CERN to follow one of the most epic and expensive scientific quest