Jupiter Moon Io's Volcanoes Revealed in New Map Thermal emission
from erupting volcanoes on the Jupiter's moon Io. A logarithmic
scale is used to classify volcanoes on the basis of thermal
emission; the larger the spot, the larger the thermal emission.
CREDIT: NASA/JPL-Caltech/Bear Fight Institute A new map of
Jupiter's oddly active moon Io has revealed the location of the
moon's many erupting volcanoes, raising as many questions about
the enigmatic satellite as it answers. The map is the most
comprehensive ever compiled of Io's hundreds of active
volcanoes, researchers said. It also suggests a complex, multi-
layer source for the moon's huge stores of internal thermal
energy, which may come as a surprise to some astronomers. "The
fascinating thing about the distribution of the heat flow is
that it is not in keeping with the current preferred model of
tidal heating of Io at relatively shallow depths," co-author
Ashley Davies, of NASA's Jet Propulsion Laboratory in Pasadena,
Calif., said in a statement. "Instea