The Cosmos


How Redshift Revealed the Universe

Just over a century ago, even the most pioneering astronomers still pictured the universe as a small, static thing that ended at the edges of the Milky Way Galaxy. But that all changed after an Indiana farm boy discovered a strange quirk of the cosmos in 1912: redshift.

Over the course of a century, redshift, the shifting of light toward the red end of the spectrum, became a tool that led astronomers to uncover some of the biggest cosmic mysteriesand to discover the incredible breadth of the universe itself.

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Greg Kestin

    Greg Kestin holds a faculty position at Harvard University, where he conducts theoretical physics research, teaches, and produces educational online content. He earned his physics Ph.D. from Harvard, as a member of The Center for the Fundamental Laws of Nature, focusing on theoretical particle physics and quantum field theory. Over his career, he has also conducted research in nuclear physics, fusion energy, and gravitational wave physics. For over a decade he has been involved with innovative educational outreach endeavors, bringing science to both students and members of the public through his writings, videos, lectures, and multimedia.

    Samia Bouzid

    Samia Bouzid is a multimedia storyteller with a passion for science, especially physics. She is a production assistant for NOVA’s YouTube series “What the Physics?!”