The 2017 Nobel Prize in physics was awarded to the discovery by the LIGO observatory of a gravitational wave signal created by two colliding black holes. But what has happened since then? What have the gravitational wave hunters learned about not only black holes, but also neutron stars and even the expansion of the universe? In this episode, associate professor Salvatore Vitale from MIT and the LIGO collaboration will answer these questions, and also describe what we can expect from the future of gravitational wave astronomy.

Salvatore Vitale's homepage.

Music credit: Jean Anguis.

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