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Messier 80, a globular cluster
Messier 80, a globular cluster

A globular cluster is a spherical collection of stars that orbits a galaxy core as a satellite. They are tightly bound by gravity, which gives them their spherical shape and relatively high stellar density towards their core. There are more than 150 known globular clusters in the Milky Way, with perhaps many more undiscovered. Large galaxies can have more: Andromeda, for instance, may have as many as 500. Some giant elliptical galaxies, such as M87, may have as many as 10,000 globular clusters. These globular clusters orbit the galaxy out to large radii, 40,000 parsecs or more. Every galaxy of sufficient mass in the Local Group and almost every large galaxy surveyed has an associated system of globular clusters. The Sagittarius Dwarf Spheroidal Galaxy and Canis Major Dwarf Galaxy both appear to be in the process of donating their associated globular clusters to the Milky Way, such as Palomar 12. (Full article...)

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Brewer Hicklen in 2022
Brewer Hicklen in 2022

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Shinzo Abe
Shinzo Abe

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July 10: Independence Day in the Bahamas (1973)

A6M Zero discovered on Akutan Island
A6M Zero discovered on Akutan Island
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African sacred ibis

The African sacred ibis (Threskiornis aethiopicus) is a wading bird and a species of ibis, of the family Threskiornithidae. The bird, native to Africa and the Middle East, is especially known for its role in the religion of the ancient Egyptians, where it was linked to the god Thoth. Visually, the African sacred ibis has an all-white body plumage, apart from the dark plumes on the rump. This African sacred ibis was photographed in Lake Ziway, Ethiopia.

Photograph credit: Charles J. Sharp

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