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Despite fantastic advances in technology, over 90% of our Universe appears to be missing. In this second programme of the series Chris Riley goes in search of this elusive so-called 'dark matter', a trail which leads him to an unlikely location - Europe's deepest mine, 1000m beneath the earth's surface. Also we meet Jocelyn Bell-Burnell, the legendary astronomer who discovered a very strange body in the late 1960s - the 'pulsar', a star so dense that a single teaspoon could weigh a hundred million tons. And we explore our nearest neighbour, the Moon, and find out why its surface could be more precious than gold dust. And we explore our nearest neighbour, the moon, and find out why its surface could be more precious than gold-dust.