Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Part of our Galaxy is exploding. Recent radio observations show new details of hot gas expanding rapidly from an energetic star-forming region in our Galactic disk out into our Galaxy's halo . The combined power of at least hundreds of supernovae are needed to drive this tremendous expansion . The mushroom cloud is one of many similar plumes , and provides important clues to the origin and nature of the Milky Way 's mysterious hot gas halo .
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