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Sunspot 4549 erupted again on Oct. 8th, producing an M6.7-class solar flare. The blast also propelled a solar tsunami through the sun’s stmosphere. It was a near-global event: A solar tsunami–formally known as a Moreton wave–is a giant, fast-moving wave of hot plasma and magnetic energy that ripples across the surface of the sun. The shock front is taller than Earth, moving faster than 1 million mph. As this wave expanded over the face of the sun, a CME lifted off. It is expected to graze…