El cielo y la tierra, son las dos cumbres del infinito.
https://es.wikipedia.org/wiki/M%C3%A9trica_de_Friedman-Lema%C3%AEtre-Robertson-Walker
![{\displaystyle {\begin{matrix}{\ddot {t}}+{\cfrac {{a'}_{t}}{2c^{2}}}\left[{\dot {r}}^{2}+{\bar {r}}^{2}\left({\dot {\theta }}^{2}+\sin ^{2}\theta {\dot {\varphi }}^{2}\right)\right]=0&\qquad {\ddot {r}}+{\cfrac {{{\dot {a}}'}_{t}}{a}}+{\dot {r}}{\dot {t}}-{\bar {r}}{{\bar {r}}'}_{r}\left[{\dot {\theta }}^{2}+\sin ^{2}\theta {\dot {\varphi }}^{2}\right]=0\\\\{\ddot {\theta }}+{\cfrac {{{\dot {a}}'}_{t}}{a}}{\dot {\theta }}{\dot {t}}+{\cfrac {{\bar {r}}_{r}}{2{\bar {r}}}}{\dot {\theta }}{\dot {r}}-\sin \theta \cos \theta {\dot {\varphi }}^{2}=0&{\ddot {\varphi }}+{\cfrac {{{\dot {a}}'}_{t}}{a}}{\dot {\varphi }}{\dot {t}}+{\cfrac {{\bar {r}}_{r}}{2{\bar {r}}}}{\dot {\varphi }}{\dot {r}}+2\tan \theta {\dot {\varphi }}{\dot {\theta }}=0\end{matrix}}}](https://wikimedia.org/api/rest_v1/media/math/render/svg/28ff781154543e03763c9faf69c34782d75b94f7)
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