Galaxies are among nature's most aweinspiring and beautifully formed objects. In this highly informative and lucidly written book, Paul Hodge seeks to demystify galaxies and to examine closely our present-day knowledge of these magnificent star systems.

Hodge brings a historical perspective to his discussion of galactic research. He presents a summary of the revolutionary discoveries of the last decade, and he shows how they have contributed to our understanding of the nature and composition of the universe. Whereas previously perhaps a dozen astronomers devoted themselves...

--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...

Beyond the range of optical perception--and of ordinary imaginings--a new and violent universe lay undetected until the advent of space exploration. Supernovae, black holes, quasars and pulsars--these were the secrets of the highenergy world revealed when, for the first time, astronomers attached their instruments to rockets and lofted them beyond the earth's x-ray-absorbing atmosphere.

"The X-Ray Universe" is the story of these explorations and the fantastic new science they brought into being. It is a first-hand account: Riccardo Giacconi is one of the principal pioneers of the...