An expert in planetary sciences offers an accessible synopsis of scientific knowledge about the celestial bodies with which we are most familiar—Mercury, Venus, Earth, and Mars.This volume in the Greenwood Guides to the Universe series covers the inner planets—Mercury, Venus, Earth, and Mars. Thematic chapters discuss all of the many areas of astronomical research surrounding each subject, providing readers with the most up-to-date understanding of current knowledge and the ways in which it has been obtained.Like all of the books in this series, Inner Planets is scientifically sound, but written with the student in mind. It is an excellent first step for researching the exciting scientific discoveries of the Earth and its closest neighbors.