Kraske wants us to believe, and gathers in supporting testimony from the like of Margaret Mead, Norman Cousins and even (posthumously and evasively) Albert Einstein for his brief on life in outer space and man's attempts to communicate with it. The thread of what ""scientists"" and, more often, ""some scientists"" believe is fairly elastic: this is for those who'd rather ponder black holes as intergalactic highways than weigh alternative theories; and we have to take Dr. Frank Drake's word for it that cosmic warfare would be ""unproductive."" Still, the possibilities opened up by Karl Jansky's discovery of radio waves from outer space is powerfully suggestive. . . even if here it leads no further than hailing the 50 million dollar Pioneer 10 as a ""cosmic greeting card.