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planet-night and day-sunrise, noon, and night-why the amount 

 of daylight varies why we have changing seasons Jupiter: 

 largest of the planets an atmosphere thousands of miles deep- 

 Jupiter has moons Saturn and its strange, gigantic rings- 

 Uranus and Neptune: distant planets Pluto: most distant of 

 them all the mysterious minor planets the moon: our neighbor 

 in space what makes "the man in the moon" phases of the 

 moon and what produces them what we will find on the moon- 

 how the moon was formed why we have eclipses of the moon 

 seeing the skies "indoors." 



13. RECOGNIZING THE STARS . . .... 405 



What sunspots are tracing the influence of sunspots eclipses of 

 the sun how the sun is "blotted out" atomic energy and the 

 sun safety measures for sun observation stars beyond the sun- 

 hundreds of thousands of light-years away how stars seem to 

 move Polaris, the North Star constellations in the night sky 

 the Great Bear and the Little Dipper the Winding Dragon- 

 Cassiopeia and Cepheus Camelopardalis stars of the summer 

 night winter stars are exceptionally brilliant some wintertime 

 favorites the signs of the Zodiac discovering the constellations 

 how astronomers study the stars telescope and camera the 

 versatile spectroscope spectacular sights in the skies the Milky 

 Way, forty billion stars the Southern Cross comets: millions of 

 miles long what comets are made of "shooting stars" are not 

 stars meteors and "fireballs" "meteor showers" two thousand 

 meteors a day "flying saucers": optical ghosts "as real as rain- 

 bows" what causes optical illusions. 



14. UNDERSTANDING THE WEATHER .... 424 



Rings around the moon the rainbow has practical value night 

 rains when the sun "draws water" unreliable predictions the 

 winds are formed why it rains how air currents affect rain sun 

 showers billions of snowflakes, no two alike snow and sleet- 

 snow is mostly air frost on the windowpane how to make frost 

 prints hail: "hot-weather ice" thunder and lightning what 

 causes lightning "lightning" in a storage battery forked light- 

 ning and other kinds when lightning is dangerous how many 

 miles between you and lightning? thunderstorms heat thunder- 

 storms "cold front" thunderstorms winter thunderstorms 

 storms of violence tornadoes: several hundred miles an hour- 

 cyclones: a confusing term hurricanes: several hundred miles 



