who took this pic
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Matt Damon
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The earth is incredibly dense by universal standards.
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Where does the ratio 1:5,000,000,000 come from? How to make sense of it? The original image is 1195px × 670px with the two objects being ≈ 900 px apart.
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On my screen the Earth looks approximately 0.5 cm in diameter. The true diameter is about 13,000 km. 0.5 cm / 13,000 km is roughly 1:3,000,000,000, so their ratio sounds about right.
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The distance between galaxies is even more staggering. Andromeda is 2.6 million light-years away from the Milky Way. The Milky Way is 150,000 light-years across. Thus, we can fit around 16,6 Milky Way’s in the space between the two galaxies.
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2.6 million ly is a staggering distance, but the ratio of the earth-moon distance to the diameter of the earth is about 30. As you said this ratio for the Milky Way-Andromeda distance to MW diameter is only 17.
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