Frank Close looks at how observations from galaxy rotation and gravitational lensing can imply the existence of dark matter.
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Watch the full lecture: http://www.rigb.org/christmas-lectures/watch/1993/the-cosmic-onion/an-hour-to-make-the-universe?utm_source=youtube&utm_medium=social&utm_term=description
Frank Close gave the 1993 lectures "The Cosmic Onion" tracing a hundred years of discovery and invention
In his final lecture, Frank Close looks at the parts of the universe that are invisible to us.
Watch the full series: http://www.rigb.org/christmas-lectures/watch/1993/the-cosmic-onion?utm_source=youtube&utm_medium=social&utm_term=description
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