The Hidden Universe The Sky at Night : Season 2003 Episode 3
BBC Four 20m
Aired: June 20th, 1957 @ 10:00 PM EST on BBC Four
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.
