The preface of Exploring Space Exploring Earth states that its objective is “…to explore the impact of space flight on geology and its subsurface counterpart, geophysics…” As promised, some of the book's chapters deal with geophysics—space geodesy, satellite studies of geomagnetism, and remote sensing. Others cover geology—impact cratering, terrestrial geology, and comparative planetology. Biology is also covered, and the book includes data acquired from Earth orbiting and planetary spacecraft.