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A bubble in space. Massive, rapid winds pouring out over several million years from three bright blue stars formed a large, hot gas stellar space, its periphery bubble is then seen as a series of irregular arcs around the much smaller "planetary" nebulae expelled by two of the stars, now shrunk into hot, blue stars called subdwarfs. On one side of the bubble the boundary arcs (which represent the interface between the bubble gas and the cooler interstellar material) are not seen, perhaps due to overlying dust clouds or because the bubble has merged there with a larger one not readily discerned in the photograph. (Photograph by the U.K. Schmidt Telescope Unit, copyright 1978, Royal Observatory, Edinburgh; used by permission.) |
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