The active volcano, Maat Mons, discovered on Venus by the Magellan spacecraft. Active volcanoes are known to exist on only two planets in the solar system, Venus and the Earth. Extinct volcanoes are seen on Mars. Two satellites are known to have active volcanoes but these are very different from those on the Earth and on Venus. On Io, moon of Jupiter, there are active sulphur volcanoes and on Triton, a moon of Neptune there are active volcanoes whose temperatures are far below zero centigrade.
Opinions differ as to whether there is evidence for extinct volcanoes on the Moon.
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