who was the first to observe it?
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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. 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. how does this bubble look like? The Local Bubble is not spherical, but seems to be narrower in the galactic plane, becoming somewhat egg-shaped or elliptical, and may widen above and below the galactic plane, becoming shaped like an hourglass.
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Local Bubble [SEP] Description
The Solar System has been traveling through the region currently occupied by the Local Bubble for the last five to ten million years. Its current location lies in the Local Interstellar Cloud (LIC), a minor region of denser material within the Bubble. The LIC formed where the Local Bubble and the Loop I Bubble met. The gas within the LIC has a density of approximately 0.3 atoms per cubic centimeter. The Local Bubble is not spherical, but seems to be narrower in the galactic plane, becoming somewhat egg-shaped or elliptical, and may widen above and below the galactic plane, becoming shaped like an hourglass.