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Children's LiteratureAstronomy is the scientific study of the stars and planets. The scientists who do the studying are called astronomers. Now their fundamental tool is the telescope. However, prehistoric humans were the first astronomers. They identified five wandering stars (planets) and identified many imaginary pictures in the stars or constellations. Four thousand years ago the Babylonian had the most advanced astronomical knowledge of the time. Around 200 BC a Greek astronomer measured the size of the Earth. The Greeks and Arabic-speaking peoples expanded on the knowledge of the Babylonians and passed it on to Medieval Europe. Today astronomers use highly evolved telescopes to collect the energy waves that are emitted from stars. The world's most powerful telescopes are located on mountaintops, many in the Americas. Five major telescopes are located in Chile. Optical and radio telescopes are also located in Arizona, New Mexico and California. This well designed and illustrated large format overview of astronomy focuses on the solar system and the stars. There is a combination of illustrations and photographs to support the basic text. Numerous sidebars on each spread provide supplemental material. 2003, Kingfisher Publishers, Ages 7 to 12.