Rank #1: Caravans in Space
These are not dreamers - although they all have an ambitious dream - but well qualified experts. Several work at Nasa, others have day jobs at universities and research institutes.
Richard hears of proposals to build giant space stations and worldships - vessels packed with the best of humanity. These caravans in space might be lifeboats to escape an approaching asteroid or perhaps the first step to colonising the galaxy.
With contributions from Technical Adviser to Nasa's Advanced Concepts Office Les Johnson, Director of the Space Engineering Centre at the University of Arizona John Lewis, architect Rachel Armstrong and anthropologist Cameron Smith.
This programme first aired in November 2016.
Jan 14 2017
Rank #2: How to Survive in Space: Deep Space
Dec 31 2015
Rank #3: Enceladus: Is There Life On Saturn's Moon?
Dec 17 2015
Rank #4: How to Survive in Space: Into Orbit
Dec 30 2015
Rank #5: Sounds of Space 1: The Solar System
Dec 18 2015
Rank #6: Sounds of Space 2: Deep Space
Dec 23 2015
Rank #7: We Shall Fly - Part One
"Quite a few false starts have been made in Africa," wrote the Ugandan philosopher and writer Taban Lo-Liyong, "...but most of us know the direction we are going – straight into the 21st Century. And to arrive there we are not going to go the way our grandparents would have gone – on foot and by canoe. We shall fly, we shall go by missiles, we shall go with the white man, we shall go with the yellow man. And we shall go by all means."
We follow this poetic, aspirational spirit through the continent’s history, from speaking to the South African hoping to be the first black African in space, to a surprising and touching example of amateur space exploration in 1960s Zambia. What do these ambitions mean, and who believes in them?
This programme was first broadcast in October 2016.
(Photo: Back dropped by planet Earth the International Space Station (ISS) is seen from Nasa space shuttle Endeavour, May 2011. Credit: Nasa)
Jan 12 2017
Rank #8: Why Does The Moon Fascinate Us So Much?
Dec 26 2015
Rank #9: The Apollo 13 Space Emergency
Dec 27 2015
Rank #10: The Beagle 2 Mission to Mars
Jan 06 2016