Arden's singularities: it can be, that I am like some a single whom he liked and dropped in early youth; and though the reduction is dreadful, the love is yet nice to recall." In Newtonian gravity, check particles can stably orbit at arbitrary distances from a central item. Generally relativity, https://econopass.com/news/science-technology/7-mind-blowing-ways-the-technological-singularity-will-transform-humanity/