Embedded clusters (EC) are stellar clusters that are partially or fully encased in an Interstellar dust or gas.
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In 1917, the astronomer Harlow Shapley was able to estimate the Sun's distance from the galactic centre based on the distribution of globular clusters; previously the Sun's location within the Milky Way was by no means well established.
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During the cruise phase of MRO, HiRISE took multiple test shots including several of the Moon and the Jewel Box cluster.
The Messier catalogue was compiled by French astronomer Charles Messier during the late 18th century and consists of 110 relatively bright deep sky objects (galaxies, nebulae, and star clusters).
The observatory offers guided tours – Moon, Solar System objects, stars, star clusters, interstellar clouds, and galaxies – and special events for a wide audience, as well as individual tours for schools and groups.
There is some evidence that the technique has been known since ancient times, as it seems to have been reported by Aristotle while observing the star cluster now known as M41.
In Saga of a Star World, he was one of the three recipients (Apollo and Starbuck being the other two) of the Golden Star Cluster, the highest military honor that could be awarded to Colonial Service warriors (similar to the Medal of Honor for the real-world United States armed forces).
Messier 103, an open star cluster in the constellation Cassiopeia
Messier 36, an open star cluster in the constellation Auriga
Messier 38, an open star cluster in the constellation Auriga
Messier 47, an open star cluster in the constellation Puppis
Messier 52 (M52), an open star cluster in the constellation Cassiopeia
Messier 93, an open star cluster in the constellation Puppis
With Sverre Aarseth, he was the first to simulate core collapse of a star cluster using a direct N-body algorithm on a Cray supercomputer.