Question

1. Which planets in our solar system have volcanoes on their surfaces ?
How were they discovered?
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Answer 1

Cryovolcanoes on Enceladus, a moon of Saturn, were first documented by the Cassini spacecraft in 2005. The spacecraft imaged jets of icy particles venting from the south polar region. This made Enceladus the fourth body in the solar system with confirmed volcanic activity.