The Planets [Paperback]

As in the TV series there are many interesting stories about the race between the superpowers to get ahead in the space race. A good nummber of insets also summarize the story behind some key discoveries and personalities in the field of astronomy.

The information is factual, well organized and the illustrations are excellent. Many of the full page images are outstanding.

Different Worlds
Beginning with a discussion of planet hunters at the Lowell Observatory in the early part of this century (searching for Planet X, which turned out to be Pluto), the chapter introduces 'the family', all the planets of our solar system, the asteroids, comets, other local phenomena, and has a brief discussion of origin and formation issues (nebulae, supernovae, planetary evolution).

Moon
As our nearest neighbour in space, the Moon has pride of place in mythology, space exploration, and in this presentation of extra-terrestrial worlds. It is amazing--the Earth is the only inner, rocky planet to have a substantial moon; this chapter discusses the space race and politics as well as science in earnest terms. The discussion of the astronauts a la The Right Stuff is always an interesting read. What is the future of the moon and humankind? Some speculation is here, with renewed interest, as the possibility of ice at the poles gives new life to lunar settlement ideas.

Terra Firma
Looking at the worlds with hard surfaces (Mercury, Venus, Earth, Mars), the chapter on Terra Firma shows the diversity of worlds that occupy the space so close to us. Each has been explored numerous times by probes; Venus has for the first time in human history revealed more than a glorious morning/evening star light, as probes and sensors have finally been able to break through the cloud cover. Mars, of course, has always held a fascination for us, particularly after the 'discovery' of 'canals' on the surface; renewed interest in Mars has been propelling NASA efforts. Included in this chapter is a brief description of some of the moons of the outer planets (Europa, Triton) which would, if not tied to a gaseous giant planet, qualify as planets on their own.

Giants
Within the past few years, humankind has finally reached all of the major planets, all of the planets known to antiquity, and all but Pluto. Even with the most powerful of telescopes, these planets never appeared as much more than blobs, save for Saturn, with her enigmatic rings (which have turned out to be far more intricate than ever before imagined or believed possible). The probes to the outer worlds showed that all have rings of some sort; all have more moons than previously known (and than are probably still known). There are worlds to explore still in our own back yard, even as we search for planets around other stars.

Stars
Beginning, obviously, with our own sun, as the guiding physical force behind almost all in the solar system, the sun has variously been regarded as a god and a demon. Yet, for all its power and prominence, the idea that it, and not the Earth, was the centre of the universe was able to cause a stir (largely theological and philosophical) that would dominate learned and popular discourse for some time. Ironically, while the Church worked to silence Galileo and Copernicus who would suggest that the sun was centre stage, they applauded when Fr. Secchi, director of the Vatican Observatory 200 years later, announced the discovery that the sun was in fact a star, like other stars, and that not even the sun was at the centre of the universe. Solar flares, storms, composition and power are all discussed.

Atmospheres
Atmospheres are thin veneers that coat some planets. These are barely worth mentioning in planetary composition terms, but, without it, no life would exist, and worlds would be very different places. The issue of atmosphere is important from the standpoint of life and space exploration. Atmosphere makes it interesting, or boring. Of course, the gaseous giants have more than their fair share of atmosphere, which again makes a difference in exploration terms. Storms are frequent on giant Jupiter, and can last for generations. Not only planets have atmosphere: Titan, a moon of Saturn reminiscent of Venus with unbroken cloud cover, is perhaps the most enigmatic and interesting world in the solar system today, with a predominantly nitrogen atmosphere (hey! like earth!) and organic chemistry (hey! like earth!)--what's going on here? In 2004 we may have a glimpse, as the ESA probe Huygens reaches the moon, and dives in, snapping pictures all the way down.

Life
Are we alone? Is there life on Mars, or indeed, are we Martians? Is there life on the moons of the giants? How does life arise? Well, this book discusses, if not definitively answers, these questions. Discussing observations and probes, experiments and speculations, the idea of life in the solar system (in smaller forms, alas, no green men here) is fully developed. Looking to harsh areas on earth which nonetheless have life forms thriving, the idea that these same inhospitable earth-based climes are no different from the better areas of other worlds takes hold. Just what is life, anyway?

Beyond the Sun
And what else is out there? Other worlds in other systems? When Voyager turned its camera around to take a snapshot of the 'family', Mars and Pluto were too faint to show up, and Earth, as a pale blue dot lacking detail, was in the midst of a 6-metre long photograph. Out among the stars, there are stellar incubators (nebulae) which grow both stars and planets; the way stars die is also presented.