Astronomy day: Seeing the Universe without light

What are gravitational waves and why are they important? What can neutrinos and other particles from space tell us about our cosmic surroundings? While telescopes measuring light in its various forms are the main tools of the astronomer, we do have some other ways of learning about what is out there in the Universe. Join us to find out what these methods have told us so far, and what the future holds for 'non-electromagnetic' (light-based) astronomy.