The Milky way Galaxy Facts | How do we know our Galaxy is spiral?

We are within the milky way Galaxy. How we find out our Galaxy is spiral shape?
How did we photograph the structure of this Milky Way galaxy within it?

We have taken more than thousands of photographs of the different galaxies from our earth. But we have to leave and travel outside of the earth to take a photograph of our home galaxy, and the travel distance is three lakh trillion kilometers. At this distance only we can get the right angle to photograph the whole Milky Way galaxy.
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