|"Prometheus Plume" on Io, NASA / JPL|
A moon of Jupiter slightly bigger than our moon shocked scientists in 1979 when Voyager cameras detected a volcanic plume in action. In the 34 years since, Io has never had a quiet day. It’s the most volcanically active body in the solar system—100 times more active than the earth. Io is a major mystery for believers in billions of years, but not for those who accept the biblical time frame.You can finish reading by clicking on the hot link, "The violent volcanoes of Io".
This is a world that, if it were really old, should be freezing—not only on the outside, because of being far away from the sun, but on the inside, too. Smaller bodies cool down much more quickly than big ones, and Io is quite tiny on a solar system scale. So even taking radioactive decay into account, Io’s interior should have become cold a long time ago. Yet it is incredibly active, and keeps spewing out the hottest lava anywhere.