参宿四变暗可能是由于大量热物质喷射形成的尘埃云阻挡了表面星光

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参宿四变暗可能是由于大量热物质喷射形成的尘埃云阻挡了表面星光Credit: NASA, ESA, and E. Wheatley (STScI) / NASA, ESA, A. Dupree (CfA