The Local Bubble is a cavity in the interstellar medium (ISM) in the Orion Arm of the Milky Way which contains, among others, the Local Interstellar Cloud and G-cloud. It is at least 300 light years across and has a neutral-hydrogen density of about 0.05 atoms/cm3, or approximately one tenth of the average for the ISM in the Milky Way (0.5 atoms/cm3), and one sixth of the Local Interstellar Cloud (0.3 atoms/cm3). The hot diffuse gas in the Local Bubble emits X-rays.
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