Milky Way
Galaxy
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The Milky Way is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye. Wikipedia
Number of stars: 100–400 billion ((1–4)×1011)
Radius: 52,850 light years
Shape: Spiral
Age: 13.61 billion years
Constellations: Sagittarius, Orion, Canis Major, and more
Angular momentum: ~1×1067 J s
Bar pattern rotation period: 160–180 Myr