what is this bubble about?
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.
Local Bubble
, 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. 
how many star are there in milky way galaxy It is estimated to contain 100–400 billion stars what is the milky way? It  is the galaxy that contains our Solar System, with the name describing the galaxy's appearance from Earth who was the first to discover this system? Galileo Galilei can you name some things that this system consists of? Sun,  eight planets small Solar System bodies, moons what is the size of the way? It is approximately 890 billion times the mass of the Sun. what does the center of this way consists of? In the inner few kpc (around 10,000 light-years radius) is a dense concentration of mostly old stars in a roughly spheroidal shape called the bulge what is the location of the sun to this way? The Sun is near the inner rim of the Orion Arm, within the Local Fluff of the Local Bubble, and in the Gould Belt. The apex of the Sun's way, or the solar apex, is the direction that the Sun travels through space in the Milky Way.
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Local Bubble [SEP] Introduction
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/cm, or approximately one tenth of the average for the ISM in the Milky Way (0.5 atoms/cm), and one sixth that of the Local Interstellar Cloud (0.3 atoms/cm). The exceptionally sparse gas of the Local Bubble is the result of supernovae that exploded within the past ten to twenty million years.