TORRENCE V. JOHNSON has an asteroid named after him: 2614 Torrence, a body about one kilometer in diameter. Working at the Jet Propulsion Laboratory in Pasadena, Calif., he has been the project scientist for Galileo since 1977--some three quarters of his career as a planetary scientist. He was a member of the imaging team for Voyager and is now on the imaging team for the Cassini mission to Saturn.
The Galileo Mission to Jupiter and its Moons
GALILEO SPACECRAFT, beset by technical troubles, still conducted a comprehensive study of the JOVIAN SYSTEM. Few predicted that the innards of these worlds would prove so varied
The Galileo Mission to Jupiter and Its Moons
Few scientists thought that the Galileo spacecraft, beset by technical troubles, could conduct such a comprehensive study of the Jovian system. And few predicted that the innards of these worlds would prove so varied
The Galileo Mission
From orbit around Jupiter, the Galileo spacecraft will take the closest look ever at the planet and its natural satellites
The Moons of Uranus
Voyager 2 photographed the five major moons at close range. All have icy surfaces, but they are darker and rockier than Saturn's moons. Early in their history three were geologically vigorous
Io
The solar system's most active volcanic world is a moon of Jupiter whose geyser like eruptions and massive lava flows yield evidence of exotic volcanic fluids. Their source of energy is gravitational
The Moons of Saturn
The 17 icy bodies that orbit the planet display a surprising range of geological evolution. Many of them show craters more than four billion years old, but one of them has terrain so new that no craters are seen