The American Heritage Student Science Dictionary is the ideal science resource for students and their families for homework, school projects, or just browsing. This updated edition includes a revised table of the planets that takes into account the demotion of Pluto from the category of planet, along with the new vocabulary created by the International Astronomical Union, including the term dwarf planet.With over 4,500 entries, 425 full-color photographs and drawings, and 175 fascinating feature notes, this is the most current and comprehensive student science dictionary available.