Celestial Mechanics in the XXIst century – challengesVivian M. Gomes, Antônio F.B.A. Prado, Cristiano F. de Melo, Elbert E.N. Macau and Othon C. WinterEur. Phys. J. Special Topics, 229 8 (2020) 1373-1377DOI: https://doi.org/10.1140/epjst/e2020-000068-6