G is for… Globular Clusters! The "Universe ABC Guide" is the ultimate source for learning amazing facts about the universe for every letter of the alphabet.

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Messier 13 (Sid Leach/Adam Block/Mount Lemmon SkyCenter, CC BY-SA 4.0 via Wikimedia Commons)
Messier 13 in Hercules is a magnificent globular star cluster with perhaps up to a million stars. This image was taken with an SBIG STL-11000M CCD and a 24-inch RCOS telescope at the Mount Lemmon SkyCenter.

Messier 80 (NASA, The Hubble Heritage Team, STScI, AURA)
This stellar swarm is M80 (NGC 6093), one of the densest of the 147 known globular star clusters in the Milky Way. Located about 28,000 light years from Earth, M80 contains hundreds of thousands of stars, all linked by their mutual gravitational attraction. Globular clusters are particularly useful for studying stellar evolution, since all stars in the cluster are the same age (around 12 billion years) but span a range of stellar masses. Each star visible in this image is either more evolved, or in a few rare cases, more massive than our own Sun. Particularly evident are bright red giants, which are stars of similar mass to the Sun and nearing the end of their lives.

47 Tucanae (ESA/Hubble)
This NASA/ESA Hubble Space Telescope image shows a globular cluster known as NGC 104 – or, more commonly, 47 Tucanae, as it is part of the constellation Tucana (The Toucan) in the southern sky. After Omega Centauri, it is the brightest globular cluster in the night sky, home to tens of thousands of stars. Scientists using Hubble observed the cluster's white dwarfs. These dying stars migrate from the crowded center of the cluster to its periphery. Although astronomers were familiar with this process, they had never seen it in action until the detailed study of 47 Tucanae. Credit: NASA, ESA and Hubble Heritage (STScI/AURA)-ESA/Hubble Collaboration Acknowledgments: J. Mack (STScI) and G. Piotto (University of Padua, Italy) About the object Distance: 15,000 light years Constellation: Tucana Coordinates Position (RA): 0 24 6.67 Position (Dec): -72° 4' 52.84/" Field of view: 2.80 x 2.74 arc minutes Orientation: North is at 14.8° left of vertical Colors and filters Band Wavelength Telescope Optical I 814 nm Hubble ACS optical V space telescope 606 nm Hubble space telescope ACS optical B 475 nm Hubble space telescope ACS ultraviolet UV 275 nm Hubble space telescope WFC3 .

Omega Centaur (ESO)
The globular cluster Omega Centauri — which has up to ten million stars — is visible in all its glory in this image taken with the WFI camera at ESO's La Silla Observatory. The image only shows the central part of the cluster – about the size of the full moon in the sky (half a degree). North is up, east is left. This color image is a composite of B, V, and I filtered images. Note that because WFI is equipped with a mosaic detector, there are two small gaps in the image that have been filled in with lower quality data from the Digitized Sky Survey. Coordinates Position (RA): 13 26 47.32 Position (December): -47° 28' 46.86/" Field of view: 31.88 x 29.99 arc minutes Orientation: North is 0.0 ° to the right of vertical Colors and filters Band Wavelength Telescope Infrared B 451 nm MPG /ESO 2.2 meter telescope WFI Optical V 539 nm MPG/ESO 2.2 meter telescope WFI Optical I 783 nm MPG/ESO WFI 2.2 meter telescope

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