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Why the long-lost planet Vulcan holds lessons for Planet Nine

Why the long-lost planet Vulcan holds lessons for Planet Nine

PRI - Elizabeth Shockman | Annie Minoff

In the late 1800s, French mathematical astronomer Urbain Jean Joseph Le Verrier announced he’d discovered a new planet. He didn’t find it with the help of a telescope, however. His discovery was based on a series of mathematical calculations. He decided to name the new planet Vulcan. The only …

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