A photograph from a spacecraft orbiting Mars shows a long, white wisp, close to a thousand miles long, spilling out of a giant volcano. Could the volcano, thought to be dormant for some 50 million years, be about to blow? Planetary scientists confidently say no. “It’s just a cloud,” said Eldar Noe Dobrea, a scientist at the Planetary Science Institute, which is based in Tucson, Ariz.
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