Survival in an extreme environment: Which is the closest globular cluster to the Galactic centre? D. Minniti, J. G. Fernández-Trincado, L. C. Smith, P. W. Lucas, M. Gómez and J. B. Pullen A&A, 648 (2021) A86 Published online: 16 April 2021 DOI: 10.1051/0004-6361/202039820