The Sky at Night

Name: The Sky at Night S47E3 - The Hidden Universe
Uploaded: 2003-03-03
Description: We don't know what it is, we can't see it and yet staggeringly it makes up 90% of our Universe. For astrophysicists, dark matter has proved to be an elusive and mysterious substance. In this episode, Patrick Moore talks to Professor Carlos Frenk about the Universe's darkest secret.