How do we know Earth isn’t flat? For thousands of years people have known Earth is round. Ancient civilizations used the stars and shadows to figure it out. Mariners confirmed it by sailing around the globe. And when the space age began, we saw it with our own eyes — Earth is round! A NASA scientist explains how we’ve known for centuries that our planet is a sphere. Explore more: https://go.nasa.gov/4kITBXo | NASA Earth
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