The Cosmos

10
Aug

5 of the Biggest Puzzles about the Universe

The discovery that light gets redder as its source moves away from Earth led astronomers to uncover some of the universe’s strangest truths, including dark energy, dark matter, and the expansion of the universe.

How well can you read these five clues and decode the universe’s best kept secrets?

Tell us what you think on Twitter, Facebook, or email.

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?!”