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Originally Posted by A Thousand Pardons
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Originally Posted by Arneb
ATM, you always seem to be the one who finds the little flaws in my questions.
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ATP 
Here's an interesting question: Why did they think there was another planet, Vulcan? |
The small difference between the predicted and observed orbit of Mercury was attributed to Vulcan. The real problem was that Newton's Laws are only approximate, when you are as close to a massive body (the Sun) as Mercury is, the difference, though very small, is nonetheless measurable. When you use GR instead of classical mechanics, the predicted orbit matches the observed orbit.