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Gravitational waves are invisible ripples in the fabric of space-time. They are caused by some of the most violent and energetic events in the universe. These include colliding black holes, collapsing stellar cores, merging neutron stars or white dwarf stars, the wobble of neutron stars that are not perfect spheres, and possibly even the remnants of gravitational radiation created by the birth of the universe. In this video, Dr. Padi Boyd explains gravitational waves and how important Hubble is to explore the mysteries of the universe. For more information, visit https://nasa.gov/hubble. Credit: NASA's Goddard Space Flight Center Producer & Director: James Leigh Editor: Lucy Lund Director of Photography: James Ball Additional Editing & Photography: Matthew Duncan Executive Producers: James Leigh & Matthew Duncan Production & Post: Origin Films Video Credit: Hubble Space Telescope Animation Credit: M. Kornmesser (ESA/Hubble) Hubble Space Telescope Animation Credit: ESA/Hubble (M. Kornmesser & L. L. Christensen), A. Fujii, Robert Gendler, Digitized Sky Survey 2, Panther Observatory, Steve Cannistra, Michael Pierce, Robert Berrington (Indiana University), Nigel Sharp, Mark Hanna (NOAO)/WIYN/NSF. LIGO Interferometer Illustration Credit: LIGO/T. Pyle Gravitational Wave Animation Credit: NASA GSFC Conceptual Image Lab Kilonova Animation Credit: NASA GSFC Conceptual Image Lab Ripples In Space-Time Animation Credit: LIGO/T. Pyle LIGO Hanford Aerial & Interior Credit: Caltech/MIT/LIGO Lab Music Credit: “Alpha and Omega” by Laurent Parisi [SACEM] via KTSA Publishing [SACEM] and Universal Production Music “Cosmic Call” by Immersive Music (Via Shutterstock Music)