Astronomers To Detect Alien Volcanoes

This artist's conception shows an extremely volcanic moon orbiting a gas giant planet in another star system. Credit: Wade Henning

From Cosmos:

SYDNEY: Astronomers may soon be able to detect volcanic activity on planets outside our Solar System, providing further insight into ‘Earth-like’ alien worlds, according to a recent paper.

When large, explosive volcanic eruptions occur, they emit high quantities of sulphur dioxide into the stratosphere. Without an eruption, however, sulphur dioxide only occurs in an Earth-like stratosphere in very small amounts.

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