In this powerful memoir, an MIT astrophysicist searches for a new life in the wake of her husband's death, even as she searches our galaxy for another Earth. Sara Seager has made it her life's work to peer into the spaces around stars--looking for exoplanets outside our solar system, hoping to find the one-in-a-billion world enough like ours to sustain life. But with the unexpected death of her husband, Seager's life became an empty, lightless space. Suddenly she was a widow at forty and the single mother of two young boys, clinging to her husband's written instructions for things like grocery shopping and home repair--tasks he had done while she explored the stars. She became painfully conscious of the social challenges that would, only years later, be explained with an autism diagnosis. She felt, for the first time, alone in the universe. In this probing, invigoratingly honest memoir, Seager tells the story of how, as she stumbled through the world of grief, she also kept looking for other worlds. She continues to develop groundbreaking projects, such as the Starshade, a sunflower-shaped instrument that, when launched into space, unfurls itself to block planet-obscuring starlight, and she takes comfort in the alien beauty of exoplanets. At the same time, she discovers what feels every bit as wondrous: other people, reaching out across the space of her grief. Among them are the Widows of Concord, a group of women offering consolation and advice, as well as her beloved sons, Max and Alex. Most unexpected of all, there is another kind of one-in-a-billion match with an amateur astronomer that brings renewed hope and love. Equally attuned to the wonders of deep space and human connection, The Smallest Lights in the Universe is a light in the dark for anyone seeking meaning and solace.