On November 15, 1915, Einstein published his greatest work: General Relativity. This theory transformed our understanding of nature’s laws and the entire history of outer space, reaching back from the present moment to the origin of time itself. Now, in celebration of the 100th anniversary of Einstein’s achievement, NOVA tells the inside story of Einstein’s masterpiece. The story begins with the intuitive and easily grasped thought experiments that set Einstein off on his quest, and traces the revolution in cosmology that is still playing out in today’s labs and observatories. Through each step of this odyssey, NOVA reveals the simple but powerful ideas at the heart of relativity, illuminating the theory—and Einstein’s brilliance—as never before. From the first spark of an idea to the discovery of the expanding universe, the Big Bang, black holes, and dark energy, NOVA uncovers the inspired insights and brilliant breakthroughs of “the perfect theory,” perhaps the greatest science story of all time.