By Vanessa V. Friedman
Updated January 20, 1995 at 05:00 AM EST

For those who always knew Star Trek was based on reality, Pale Blue Dot will be vindication. Carl Sagan’s big follow-up (with plentiful and seductive pictures, it clocks in at just over 400 pages) to his best-selling Cosmos is the story of man’s future in space — which, according to the author, is the only possible place for our species to even begin to consider having a future. Like a Mr. Spock with sympathy, he describes each planet’s topography, gravitational forces, moons — and meaning. Meaning because, in order to live on after destroying this planet, we will have to live elsewhere. In his explanations and philosophizing, Sagan veers from the technical to the religious, but he is always eminently readable, and sometimes even enthralling. He’s a true believer in the wealth of the universe, and he may yet make apostles of us all.A-