23/30 Heather Couper looks at the discovery of quasars, huge black holes a long way from Earth.
22/30 Heather Couper considers how the concept of black holes gained credence in astronomy.
2/2 What's the speed limit of the human body? Gareth Mitchell investigates.
21/30 The discovery of radio waves in space, and how it led to the discovery of the pulsar.
20/30 The Big Bang theory of how the universe began, and what its opponents think.
Does life on Earth have an extraterrestrial origin?
Quentin Cooper celebrates the 60th anniversary of the modern computer.
19/30 How did the discovery that the universe is expanding impact upon Einstein's theories?
Laurie Taylor discusses the driving forces and patterns of gentrification in the UK.
18/30 Heather Couper traces our understanding of nebulae, island universes outside our galaxy.
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