<p>Dark Matter is a proposed form of matter that does not absorb, reflect or emit light. It is known to make up 27% of our universe, while the matter that makes up stars and galaxies accounts for only 5%.   
  
In this archive episode, first released in March 2015, Melvyn Bragg and his guests discuss dark matter, the mysterious and invisible substance existing throughout the Universe. In 1932 the Dutch astronomer Jan Oort noticed that the speed at which galaxies moved was at odds with the amount of material they appeared to contain. He hypothesized that much of this 'missing' matter was simply invisible to telescopes.    
  
Today astronomers and particle physicists are still fascinated by the search for dark matter and the question of what it is.    
  
One leading theory is that Dark Matter is made up of WIMPS (Weakly Interacting Massive Particles) that are big, heavy and move slowly, interacting with gravity but not other particles.    
  
Scientists have developed multiple theories about the make up of this substance, and they are able to test them through remarkable computer modelling that simulates the construction of the universe.   
  
With   
  
Carolin Crawford 
Public Astronomer at the Institute of Astronomy, University of Cambridge and Gresham Professor of Astronomy   
  
Carlos Frenk 
Ogden Professor of Fundamental Physics and Director of the Institute for Computational Cosmology at Durham University   
  
Anne Green 
Reader in Physics at the University of Nottingham   
  
Producer: Thomas Morris   
  
In Our Time is a BBC Studios production   
  
A world-class seminar every week. Spanning history, religion, culture, science and philosophy, In Our Time celebrates the pursuit of knowledge and the enduring power of ideas. In each episode, host Misha Glenny and expert guests explore the characters, events and discoveries that have shaped our world.</p>

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