Photo of Neil de Grasse Tyson

Neil de Grasse Tyson is the Frederick P. Rose Director of the Hayden Planetarium at the American Museum of Natural History in New York City and a Visiting Research Scientist in astrophysics at Princeton University. Since 1995, Tyson has written the popular monthly essay "Universe" for Natural History magazine. He is also the author of Universe Down to Earth, a collection of essays exploring the connections between concepts of science and everyday experience, and The Sky Is Not the Limit: Adventures of an Urban Astrophysicist, a memoir. A graduate of the Bronx High School of Science, Tyson earned a B.A. in physics from Harvard College and a Ph.D. in astrophysics from Columbia University. Tyson lives in New York City.

Photo of Charles LiuCharles Liu is an astrophysicist at the American Museum of Natural History and a Visiting Research Scientist at Columbia University. His research focuses on the evolution of galaxies, and his work has appeared in numerous publications, including The Astrophysical Journal and The Astronomical Journal. Liu received a B.A. in both astronomy and astrophysics and physics from Harvard College and a Ph.D. in astronomy from the University of Arizona. He lives in Montclair, New Jersey.

Photo of Robert IrionRobert Irion, a freelance science journalist in Santa Cruz, California, is a contributing editor at Astronomy magazine and a contributing correspondent to Science magazine. He holds a B.S. in earth and planetary sciences from the Massachusetts Institute of Technology and studied science communication at the University of California, Santa Cruz, where he now teaches science writing. His articles on astronomy, earth science, and physics also have appeared in New Scientist and other publications. He lives in Santa Cruz.