Unpaginated [58p]: illustrated endpapers, illustrations nearly every page many brightly coloured; 21cm. oblong. VERY GOOD minimal ex-library (two library stamps, pocket removed with very little residue left-over; spine ends slightly frayed, tips bumped; interior clean, bright & tight). No dj. The author is an astronomer and was the director of Educational Services at the American Museum-Hayden Planetarium. Large print, fairly easy reading.