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　　Brian Cox tackles some of the most challenging and intriguing questions facing science today by using his best material from past programmes and the latest scientific research.　　Episodes include…　　Space: How Far Can We Go?（太空：我们对宇宙的探索能走多远？）　　Brian believes we are at the start of a new age of space travel, where space flight is on the verge of becoming routine. In this episode, he explores the latest science and takes a new look at his old films and asks: how far can we go in our exploration of the cosmos?　　Aliens: Are We Alone?（外星人：人类是唯一的吗？）　　Brian Cox looks at our attempts to answer one of the most profound questions we can ask – are we alone in the universe? In this film, he explains why this search should be taken seriously.　　What Is Gravity?（什么是引力？）　　Brian takes a fresh look at the concept of gravity, revealing it to be far more than just the force that makes things fall to the ground.　　What is Time?（什么是时间？）　　Brian explores the enigma of time – a phenomenon that we take for granted but which, as far as physicists are concerned, is one of the biggest mysteries in the universe.