New evidence supports the notion that Jupiter's moon Europa contains an ocean beneath its icy surface, and a planetary scientist has proposed a novel way that Europa could be getting the energy required to sustain life within that ocean. (p. 70)

Planetary scientists have for the first time precisely dated a collision that smashed an asteroid into fragments. (p. 30)

About one out of every eight asteroids traveling near Earth has a rocky companion. (p. 317)

Flight controllers have revived an instrument on the Mars Odyssey spacecraft that measures the amount of radiation bombarding the Martian surface. (p. 205)

Simultaneous measurements by two spacecraft have probed in greater detail than ever before Jupiter’s magnetosphere, the invisible bubble of charged particles that surrounds the giant planet. (p. 174)