Astronomers analyzing 3D maps of the shapes and sizes of nearby molecular clouds have discovered a gigantic cavity in space. The sphere-shaped void pans about 150 parsecs—nearly 500 light years. Researchers believe the cavity was formed by ancient supernovae that went off some 10 million years ago.
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ALMA Spots Quiescent Molecular Clouds and Tides around Milky Way’s Supermassive Black Hole
