“The Invisible Universe: Why Dark Matter Matters”

We can’t see it, but it’s all around us. And unlike God, there is scientific evidence of its existence. We’re talking, of course, about dark matter: Columbia postdoc Kerstin Perez delivers a lecture on this astrophysical mystery in “The Invisible Universe: Why Dark Matter Matters.” After the half-hour talk, peer up at the night sky in a guided stargazing session (8:30–10pm). Go to outreach.astro.columbia.edu for more information.