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เนื้อหาย่อ : THE MOON: EARTH'S NATURAL SATELLITE by Franklyn M. Branley Mlastraied by Helmut K. Wimmer THE woox appears to be a faraway, inert body that is alternately blistering hot and freezing culd. Bat the sunlight it reflects has affected man eudtionally since the beginnings of his history. Going beyond folklore and mythology, scien- tists have built up a body of knowledge about our natural I satellite, and with clarity and enthu- Dr. Branley has distilled their findings. There are clear discussions of the moon's mo- and why the moon stays in orbit; the pull of tbe earth and moon on each other; tempera- hures on the moon (214* above zero, 250* be- low zero--and why); how these temperatures are measured (with directions for making your ewm thermocouple) ; atmosphere on the moon (mome-and why); eclipses; features of the on's surface; tides (ocean tides and tides of dhe moon's surface). Handsome pictures show dhe so-called seas, the craters, the mountains; interesting charts and diagrams explain the mass and density of the moon. What man will probably find on the moon when he gets there and the conditions he must adjust to in order to survive are described with- in the framework of true science. There is evi- dence that Babylonians thought about going to the moon thousands of years ago. Now that man is on the threshold of lunar landings, Dr. Bran- ley provides background information essential to an understanding of the current and forth- coming news. Dr. Branley is an associate astronomer at the American Museum-Hayden Planetarium. Hel. mut K. Wimmer, whose handsome and vivid pictures and charts have set a new standard in the feld of astronomy, is a colleague of Dr. Branley's at the Planetarium.