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TELL US WHAT YOU THINK and help us improve our Free Educational Resources https://www.surveymonkey.com/r/2015_YouTube_descr For more like this subscribe to the Open University channel https://www.youtube.com/channel/UCXsH4hSV_kEdAOsupMMm4Qw Free learning from The Open University http://www.open.edu/openlearn/science-maths-technology/science/physics-and-astronomy/dark-matter --- Fritz Zwicky was a Swiss astronomer who discovered Dark Matter in the Universe. But what's the matter with dark matter? (Part 8 of 14) Playlist link - http://www.youtube.com/course?list=EChQpDGfX5e7CSp3rm5SDv7D_idfkRzje- --- Study science with the OU http://www3.open.ac.uk/study/undergraduate/qualification/science/physics-and-astronomy/index.htm OU on the BBC: Stargazing LIVE http://www.open.edu/openlearn/whats-on/ou-on-the-bbc-stargazing-live ---