Littmann, Mark

Mark Littmann holds an endowed professorship in science writing at the University of Tennessee, where he teaches both writing and astronomy. He has written several popular astronomy books, including Planets Beyond: Discovering the Outer Solar System, which won the Science Writing Award of the
American Institute of Physics; and Comet Halley: Once in a Lifetime (with Don Yeomans), which won the Elliott Montroll Special Award of the New York Academy of Sciences.
Fred Espenak is the most widely recognized name in solar eclipses. He is an astrophysicist at NASA's Goddard Space Flight Center,