What are gravitational waves? Gravity seems like a familiar enough concept, but what exactly is waving?

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A landmark day for Einstein and our understanding of the universe: the detection of gravitational waves. Brian Greene explains the discovery. (3:10 min.)

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After a decades-long quest, The MIT-Caltech collaboration LIGO Laboratories has detected gravitational waves, opening a new era in our exploration of the universe. (5:26 min.)

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As the year 1905 began, Albert Einstein faced life as a “failed” academic. Yet within the next twelve months, he would publish four extraordinary papers, each on a different topic, that were destined to radically transform our understanding of the universe. (5:15 min.)

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