A picture taken by the European Space Agency’s Mars Express spacecraft showing an elongated white plume that resembles volcanic ejecta. Credit ESA/GCP/UPV/EHU Bilbao.

This week, the European Space Agency released a picture taken by its Mars Express orbiter that showed what it described as “a curious cloud formation” stretching from east to west near Arsia Mons, the southernmost in a string of three volcanoes.

(Kenneth Chang, “A Volcanic Eruption on Mars? Nope,” NYTimes, 10-30-18)

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