https://www.planetary.org/space-images/globular-cluster-m13-inverted-version
Globular cluster M13 (inverted version) | The Planetary Society
Globular cluster M13 (inverted version)
globular cluster m13invertedversionplanetarysociety
https://esahubble.org/images/opo0840a/
Hubble image of globular cluster M13 | ESA/Hubble
Hubble image of globular cluster M13
globular cluster m13hubble imageesa
https://arxiv.org/abs/1903.00350
[1903.00350] Observations of the Ultraviolet-Bright Star Barnard 29 in the Globular Cluster M13...
Abstract page for arXiv paper 1903.00350: Observations of the Ultraviolet-Bright Star Barnard 29 in the Globular Cluster M13 (NGC 6205)