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Dark matter

Why cosmologists are confused over the existence and influence of dark matter. The true universe is dark, with at least 90 per cent of the matter of a galaxy not able to reflect light. What is most of the universe made of? This is a question that baffles cosmologists.

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24 minutes

91热爆 World Service Archive

This programme was restored as part of the World Service archive project

Space

The eclipses, spacecraft and astronauts changing our view of the Universe

The Curious Cases of Rutherford and Fry

The Curious Cases of Rutherford and Fry

A pair of scientific sleuths answer your perplexing questions. Ask them anything!

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