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We do know quite well what our galaxy looks like thanks to great advances in astronomy. To use your car analogy, it would be like using “X-ray”technology to map the exterior from the interior and get a reasonably accurate picture of the shape of our car.
We do know quite well what our galaxy looks like thanks to great advances in astronomy. To use your car analogy, it would be like using “X-ray”technology to map the exterior from the interior and get a reasonably accurate picture of the shape of our car.
https://www.astronomy.com/science/how-we-learned-the-shape-of-the-milky-way/