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by nl 5774 days ago
This is a pretty good explanation: http://news.ycombinator.com/item?id=1631206

You've got two problems, though: 1) We don't yet have a consistent explanation for what gravity is. General Relativity is good, but breaks down at small distances. 2) At some point, physics becomes math, and at some point after that there are no explanations. For example, why does 1=1? Basically, the answer is "by definition".