Milky Way Galaxy A giant It has a mass between 750 billion and one trillion solar masses, And its diameter is about 100,000 light years Spiral Galaxy Concluded that it is spiral through the use of radio astronomy and observations of other galaxies
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225,000,000 years for the Sun to circle the Milky Way
age of sun is about 4,500,000,000 years
Alpha Centauri complex (triple-star system)
Proxima Centauri at 1.3 pc (4.3 ly) 0.76 arc-secs
Barnard's Star 1.8 pc (6.0 ly) 0.55 arc-secs
The lower the metal abundance (pop I vs. pop II), the farther the objects are found from the plane of the disk (remember, low metal abundance (pop II) means old)
stars are born with elemental abundance's of gases of birth
stars inherit orbital motion abut galaxy of parent cloud
massive stars evolve quickly and spew heavy elements into interstellar medium.