Io
Io is a moon of Jupiter. Because there is no atmosphere to contain the dust particles, volcanic eruptions on Io resemble vast sprinklers, spraying dust and debris as high as two hundred eighty kilometers and as wide as one thousand kilometers. At any time at least one of the eight suiphurous volcanoes is erupting.
The temperate zones on Io stay around 81 degrees Fahrenheit. On one of these temperate zones Emperor Dark has placed a robot outpost.
Source: Starcom Series Bible