B Adorable Gravity Demo - National Medals Lab

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ergospherical said:
Cute demo
... of an interactive gravitational body simulator.
 
Hm. I'm not sure just how good it is.

I just set two massive bodies co-orbiting, which worked fine until I added a third smaller body.
The third boy seemed to orbit only one of the massive bodies, and remained unaffected by the other.
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It would be nice to see how they coded it and what shortcuts they used (which might explain that behaviour you found for the restricted three body problem) but I couldn't find any documentation.
 
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The Poynting vector is a definition, that is supposed to represent the energy flow at each point. Unfortunately, the only observable effect caused by the Poynting vector is through the energy variation in a volume subject to an energy flux through its surface, that is, the Poynting theorem. As a curl could be added to the Poynting vector without changing the Poynting theorem, it can not be decided by EM only that this should be the actual flow of energy at each point. Feynman, commenting...

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