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Jupiter's iconic storm is dying. Over the past week, amateur astronomers around the world have seen some unusual activity around the solar system's largest and longest-lasting storm, known as the Great Red Spot (GRS). The swirling red clouds that have been raging over the giant planet for centuries have been spotted forming "propellers" along the storm's edges, with these blade-like shapes spinning off and ultimately dissipating. "This is very uncharted territory," said Glenn Orton, a senior research scientist at NASA's Jet Propulsion Laboratory who studies Jupiter. "We've never seen it like this before."