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How wide is the Universe?
The Universe is at least 80 billion light years wide, at the latest estimate. Explorer sent into the Australian Outback to discover what qualities needed by astronauts sent on a future mission to Mars. The mass of the top quark is measured. Can maths make European Union democracy fairer?
BBC World Service Archive
This programme was restored as part of the World Service archive project
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Science In Action
The BBC brings you all the week's science news.
