Einstein’s Gravity Playlist

What are gravitational waves?  How are these ripples in space-time created?  Albert Einstein predicted there existence in 1916, and a century later, scientists detected these waves using incredibly precise laser technology here on Earth.  See the Laser Interferometer Gravitational-Wave Observatory (LIGO) and Lucia, a PhD student in physics, on an exploration of gravitational waves and their importance in helping understand the universe.