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The Sky at Night: Watch This Space

on BBC One London

How 'empty' is space? Astronomers used to think that there was no material between the stars, or between the galaxies; they now know that there is a great deal.

Patrick Moore talks about interstellar material to Professor Alec Boksenberg, Director of the Royal Greenwich Observatory.

Contributors

Presenter:
Patrick Moore
Guest:
Professor Alec Boksenberg
Producer:
Pieter Morpurgo

BBC One London

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