Most of our Universe is Missing is another episode in the long lasting series BBC Horizon. This episode is narrated by Academy Award nominated actor Sir Ian Holm.
I will give a brief intro about what this episode deals with.
Do you know that around 96% of our universe is missing? And I'm not talking about the vast emptiness that we see. All the galaxies with stars, planets & other debris that you see has a total mass of only 4% of our universe.
Prior to 1970, everything in our universe is accounted for. Or that is what most people thought. But in the 1970s Prof. James Peebles & Prof. Jeremiah Ostriker, who were working on the stability of the galaxies & universe, found that with the notions of total mass existed at that time, the stability of the galaxies is difficult to achieve. They were thinking of some missing matter that is unknown to us & they came to know that forty years earlier Prof. Fritz Zwicky had the same ideas about missing matter. Thus our Dark Matter was discovered in theory. But the problem for others to accept this is that neither dark matter could be seen nor it was discovered practically. So, many of the others dismissed it as speculative.
