Risa Wechsler
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Watch my TED talk on why dark matter matters!

Here I describe what the universe is made of in just 3 minutes! For a longer more detailed version, see Mapping the Cosmos, an hour long chalk talk and discussion at the Kavli Institute for Theoretical Physics (Spring 2017), or Mapping the Dark Cosmos, a public talk at the Aspen Center for Physics (Summer 2018),

I discussed what we know and don't know about dark matter with Brian Greene and others at the World Science Festival in May 2019.
The full discussion is about 80 minutes.

Public Lecture at the Royal Institution with Adam Riess, Renee Hlozek, and me (I start talking about "Tracing the Dark Universe with Galaxies" around minute 25, followed by Q&A moderated by Lucie Green, July, 2015

My 7 minute TEDxYouth talk, given for a great group of students at Castilleja High School, 2010

other recent lectures


  • Physics in the Dark: A Search for the Universe's Missing Matter, World Science Festival, May 2019
  • Mapping the Dark Universe with Galaxy Surveys, Aspen Center for Physics, August 2018
  • Science Sundays Public Lecture, Ohio State University, November 17, 2013
  • Frontiers of Astronomy, Cleveland Museum of Natural History November 14, 2013
  • Galaxy Formation in Dark Universe, San Francisco Amateur Astronomy Society, Randell Museum, San Francisco, October 2012​​
  • Dark Matter: The Search for 85% of the Mass in the Universe, Heinz Pagels Lecture, Aspen, August 2011
  • Understanding Dark Matter, Kavli Frontiers of Science, 2009 [video here]
  • Dark Energy: What the...? SLAC Public Lecture, October 2007 [video here] see especially the earthshaking moment @ min 34.​


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  • Home
  • Who
    • GFC Group
    • CV
  • What
    • Research
    • Collaborations
    • Publications
    • Press
    • Technical Talks
    • Public Talks
    • Teaching
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  • News
  • Useful things