page_title: Local Bubble
hierarchical_section_title: Local Bubble
caption_attribution_description: English: The Local Bubble.
context_page_description: The Local Bubble, or Local Cavity, is a relative cavity in the interstellar medium of the Orion Arm in the Milky Way. It contains among others, the Local Interstellar Cloud, which contains the Solar System, and the G-Cloud. It is at least 300 light years across and is defined by its neutral-hydrogen density of about 0.05 atoms/cm³, or approximately one tenth of the average for the ISM in the Milky Way, and one sixth that of the Local Interstellar Cloud.
  The exceptionally sparse gas of the Local Bubble is the result of supernovae that exploded within the past ten to twenty million years. The gas remains in an excited state, emitting in the X-ray band. Geminga, a pulsar in the constellation Gemini, was once thought to be the remnant of a single supernova that created the Local Bubble, but now multiple supernovae in subgroup B1 of the Pleiades moving group are thought to have been responsible, becoming a remnant supershell.
context_section_description: The Local Bubble, or Local Cavity, is a relative cavity in the interstellar medium (ISM) of  the Orion Arm in the Milky Way. It contains among others, the Local Interstellar Cloud, which contains the Solar System, and the G-Cloud. It is at least 300 light years across and is defined by its 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 that of the Local Interstellar Cloud (0.3 atoms/cm³).
  The exceptionally sparse gas of the Local Bubble is the result of supernovae that exploded within the past ten to twenty million years.  The gas remains in an excited state, emitting in the X-ray band. Geminga, a pulsar in the constellation Gemini, was once thought to be the  remnant of a single supernova that created the Local Bubble, but now multiple supernovae in subgroup B1 of the Pleiades moving group are thought to have been responsible, becoming a remnant supershell.
caption: Artist's conception of the Local Bubble (containing the Sun and Beta Canis Majoris) and the Loop I Bubble (containing Antares)
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