{"type":"rich","version":"1.0","title":"Planetary orbit","html":"<span class=\"wb-embed wb-embed-math\" data-latex=\"\\ddot{\\mathbf{r}}\n=\n\\mu\\frac{\\mathbf{r}}{r^3}\">\\ddot{\\mathbf{r}}\n=\n\\mu\\frac{\\mathbf{r}}{r^3}</span><footer><cite class=\"wb-embed-author\">Rong Martin-Siebler ZHOU</cite></footer>","width":640,"height":320}