what is the size of the way?
It is approximately 890 billion times the mass of the Sun.
Milky Way
 The Milky Way is approximately 890 billion times the mass of the Sun. 
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
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Milky Way [SEP] Size and mass
The Milky Way is the second-largest galaxy in the Local Group (after the Andromeda Galaxy), with its stellar disk approximately in diameter and, on average, approximately thick. The Milky Way is approximately 890 billion times the mass of the Sun. To compare the relative physical scale of the Milky Way, if the Solar System out to Neptune were the size of a US quarter (), the Milky Way would be approximately the size of the contiguous United States. There is a ring-like filament of stars rippling above and below the relatively flat galactic plane, wrapping around the Milky Way at a diameter of , which may be part of the Milky Way itself.