--Spokes and braids in the rings of Saturn

--Eddying currents around Jupiter's Great Red Spot

--Volcanic eruptions on the satellite Io

These are the images from Voyager that have made headlines and captured the public imagination. Now, a giant of twentieth century astronomy guides us on a literary voyage of discovery that retraces the steps of this and other recent space probes--Viking, Mariner, Pioneer, as well as Russian efforts--that have revolutionized our understanding of Earth's nearest neighbors. Every step of the way, Fred Whipple provides the basic foundation in astronomy that enables the reader to be not merely awed and entranced but thoroughly informed, with a solid and satisfying understanding of the workings of our solar system.

In a dazzling combination of text and illustrations, "Orbiting the Sun" offers vistas that rival science fiction:

--mountains on Mars twice the height of Everest

--thunderstorms and sulfuric acid clouds on Venus

--the possibility of liquid nitrogen oceans on Titan

But the author also explores in precise detail the tests carried out by the Viking Lander that with virtual certainty have ruled out the hope of finding life on Mars.

This completely revised and updated edition of Whipple's classic "Earth, Moon, and Planets" once again presents Earth within its planetary context. This view allows us to speculate on such provocative concepts as the connection between an asteroid collision and the extinction of the dinosaurs. But the most obvious enhancement of this new edition is the stunning photographs, that include the eerie panorama of the Martian landscape taken from the Viking Landers, the dramatic sweep of Saturn's thousand rings, and full color port raits of the Jovian moons--the battered face of Callisto, Europa with its web of thin scratches, the "superhighways" of Ganymede, and Io with its volcanic plumes.

Fred Whipple has introduced two generations of student and amateur astronomers to the wonders of the solar system. In "Orbiting the Sun" he will charm and inform an entirely new audience.

As this excellent book demonstrates, the study of comets has now reached the fas cinating stage where we understand comets in general simple tenns while, at the same time, we are uncertain about practically all the details of cometary nature, structure, processes, and origin. In every aspect, even including dynamics, a choice among several or many competing theories is made impossible simply by the lack of detailed knowledge. The space missions, snapshot studies of two comets, partic ularly the one that immortalizes the name of Sir Edmund Halley, have produced a huge mass of valuable new infonnation and a number of surprises. Nonetheless, we face the tantalizing realization that we have obtained only a fleeting glance at two of perhaps a hundred billion (lOll) or more comets with possibly differing natures, origins, and physical histories. To my personal satisfaction, comets seem to have discrete nuclei made up of dirty snowballs, as I concluded four decades ago, but perhaps they are more like frozen rubbish piles.

Smithsonian Contributions To Astrophysics, V2, No. 5.

Smithsonian Contributions To Astrophysics, V2, No. 5.