Science Explorer -- Astronomy

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Publication Date: 2002-10-01
Features: "Science Explorer" - the most authoritative research-based learning textbook in the United States. Widely used comprehensive science textbook in U.S. middle schools. The best reference book for new curricula, new concepts, and new learning methods. Full set of 15 volumes: Motion, Force, and Energy; Water on Earth; Sound and Light; Electricity and Magnetism; Astronomy; Chemical Reactions; Matter Composition; Environmental Science; From Bacteria to Plants; Cells and Genetics; Animals; Human Physiology; Earth's Interior; Evolution of the Earth's Surface; Weather and Climate. Explore the mysteries of science, guide research-based learning, emphasize knowledge, skills, and methods, with hands-on, brain-stimulating fun. Original edition by the Zengyin Education Group, used in over 20 developed countries. Jeanne is observing objects beyond the outer planets of the solar system, which form a ring around the Sun composed of millions of ice rock fragments. and her collaborator David Jewitt first discovered these objects in 1992. Pluto, the rocky planet, is the largest object in this ring, which is called the Kuiper Belt. Pluto and approximately 3,000 other objects travel through space together. and Jewitt call these objects the "Plutinos." In the Kuiper Belt, some objects escape and move closer to the Sun. The Sun's heat makes them glow and transform into comets.