If I look into the sky and I see two yellow dots it’s all stars for me. Then I hear one of them is mars and I’m like „ok, still looks the same“. How did the people hundred of years ago discover what’s a close planet and what’s a far away star?
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Well, it was hundreds of years ago and there was little to do. It was dark since light pollution was hundreds of years away. Copernicus and Kepler tracked movements and noticed that some of the ”stars” had unusual movements.
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