The stellar “disk” of the Milky Way Galaxy (normally what we can observe in the clear night sky) is approximately 100,000 light years across, and close to 1,000 light years thick. Estimates vary on exactly how many stars we have in our galaxy. Most put star population anywhere between 200 and 400 billion for the Milky Way.
To give an impression of how long a light year is, the International Astronomical Union says one light year is 9,460,730,472,580.8 km long. That puts our galaxy’s diameter in the quadrillions of kilometers: about 946,073,047,258,080,000 km!
Interestingly, the nearest galaxy is the Canis Major Dwarf. It is 25,000 light years away from Earth.
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