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17 September 2014
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> Bye bye Planet Pluto
The vote is now closed.
Programme summary
Before Pluto was demoted, astronomers were struggling to define what a planet is
Video vote
Do you think Pluto should remain a planet?
Are we Alone in the Universe?
The search for alien life is 50 years old, but a planet has been discovered that could support life.
Prof. Regan's supermarket secrets
Prof. Regan tests the scientific claims of supermarket products
How to live to 101
A few isolated communities seem to hold the secrets to long life.
How to make better decisions
Lifting the lid on the business of human choices in an exclusive guide to making better decisions.
More recent Horizons
The eight planets
Comprehensive guide to Pluto
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