Question 32 :Milky way

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The Milky Way is the galaxy that includes our 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.

Radius: 52,850 light years 

Age: 13.51 billion years

Earth is inside the milky way....

Question : What device took a picture of the Milky way?

How long did that take? Cuz 52,850 lights is a lot of years... 

How did scientist calculate the age of the Milky Way? 

Did they take a rock from the Milky Way and decided that was the age ? 

But that wouldn't really makes sense because the rock could be really young or old compare to the actual age of said Milky Way🤔

Also they are saying the radius of the Milky way is 52,850 light years but thats only the radius 

How did they figure out the radius  ? 

And to find the entire length of the Milky Way would we have to find the circumference because it is sort of circular ?

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