PLATE 2.2 Voyager spacecraft images of Jupiter's moon Io revealed the presence of sulfurspewing volcanoes (left). Observations with an infrared camera on NASA's Infrared Telescope Facility (IRTF) on Mauna Kea made a diffraction-limited 3-µm image of the Loki, the brightest of these volcanoes (right). Courtesy of the Jet Propulsion Laboratory and the IRTF.

PLATE 2.3 Radar images of the asteroid 1989 PB made at the Arecibo Observatory near the time of closest approach of 2.5 million miles. The dumbbell-shaped asteroid is about a mile across and rotates with a period of about 4 hours. Courtesy of S. Ostro, Jet Propulsion Laboratory.

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