Inspirational talk by Professor Joseph Silk FRS on the giant clusters of galaxies dominated by dark matter http://www.gresham.ac.uk/lectures-and-events/the-dark-side-of-the-universe
Dark matter dominates the contents of the universe. The Milky Way is full of dark matter. Is dark matter an as yet undiscovered particle? The search for dark matter focuses on deep underground and large telescopes on the earth and in space. The most massive objects in the universe are giant clusters of galaxies that are dominated by dark matter.
Clusters are dark matter telescopes and amplify background galaxy images. Clusters are used to map the distribution of dark matter throughout the universe.
The transcript and downloadable versions of the lecture are available from the Gresham College website: http://www.gresham.ac.uk/lectures-and-events/the-dark-side-of-the-universe
Gresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 1,900 lectures free to access or download from the website.

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