{"type":"rich","version":"1.0","title":"Gravitational potential energy between many point masses","html":"<span class=\"wb-embed wb-embed-math\" data-latex=\"U=-G\\sum_{i<j}\\frac{m_i m_j}{\\mathbf{r_i}-\\mathbf{r_j}}\">U=-G\\sum_{i&lt;j}\\frac{m_i m_j}{\\mathbf{r_i}-\\mathbf{r_j}}</span><footer><cite class=\"wb-embed-author\">Rong Martin-Siebler ZHOU</cite></footer>","width":640,"height":320}