Source: Atlas Obscura
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The first six planets (Mercury through Saturn) have been known and described since the time of the ancient Greeks, and probably long before. They were called “wanderers” because of their strange behavior compared to the stars.
It wasn’t until the early 1600s when Galileo pointed his telescope at the sky that planets were seen as other worlds outside of ours. Still, the solar system didn’t expand beyond the ancient model until the early 19th century, when Uranus was…The post The telescope that discovered Neptune. appeared first on FeedBox.