--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...