Local Bubble
The Local Bubble, or Local Cavity, is where we are in our galaxy. It 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. It has a neutral-hydrogen density of about 0.05 atoms/cm3, or about one tenth of the average for the ISM in the Milky Way (0.5 atoms/cm3)