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Below are the episodes of the Jodcast (or segments) which match the keyword blackhole. You can continue searching by going back to the tag cloud.

• Interview with Dr Ben Maughan (University of Bristol) - June 2008 (MP3)
  Ben Maughan describes how to weigh clusters of galaxies. The story starts with observations by Fritz Zwicky in the 1930s. Zwicky observed spectral lines from galaxies and found that the galaxies were moving around faster than expected. Adding up all the mass in the galaxies didn't provide enough mass to hold the cluster together by gravity. This was one of the first times dark matter was inferred. With the launch of X-ray observatories astronomers have observed hot, ionised gas in galaxy clusters and these observations also show a need for dark matter. Ben tells us about his research and how galaxy clusters are like Dr Evil.