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how the planets and sun got their gravitational force |
| Gravity is one of the most familiar forces of nature, but also one of the most resistant to a proper, complete and satisfying explanation.Einstein's (and Newton's) theory features that mass create the effects of gravity.We still don't know why matter and energy has gravity, only that it does. Given that as a starting point, we know lots about gravity already but still not as much as we would like to, and it continues to be an active area of research. |
