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  2. Messier 13 - Wikipedia

    en.wikipedia.org/wiki/Messier_13

    Messier 13, or M13 (also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules, the Hercules Globular Cluster, or the Great Hercules Cluster), is a globular cluster of several hundred thousand stars in the constellation of Hercules.

  3. Arecibo message - Wikipedia

    en.wikipedia.org/wiki/Arecibo_message

    As globular cluster M13, at which the message was aimed, is more than 25,000 light-years from Earth, the message, traveling at the speed of light, will take at least 25,000 years to arrive there. By that time, the core of M13 will no longer be in precisely the same location because of the orbit of the star cluster around the Galactic Center . [ 2 ]

  4. Globular cluster - Wikipedia

    en.wikipedia.org/wiki/Globular_cluster

    The first known globular cluster, now called M 22, was discovered in 1665 by Abraham Ihle, a German amateur astronomer. [4] [5] [6] The cluster Omega Centauri, easily visible in the southern sky with the naked eye, was known to ancient astronomers like Ptolemy as a star, but was reclassified as a nebula by Edmond Halley in 1677, [7] then finally as a globular cluster in the early 19th century ...

  5. Messier object - Wikipedia

    en.wikipedia.org/wiki/Messier_object

    The Messier catalogue comprises nearly all of the most spectacular examples of the five types of deep-sky object – diffuse nebulae, planetary nebulae, open clusters, globular clusters, and galaxies – visible from European latitudes. Furthermore, almost all of the Messier objects are among the closest to Earth in their respective classes ...

  6. List of globular clusters - Wikipedia

    en.wikipedia.org/wiki/List_of_globular_clusters

    These are globular clusters within the halo of the Milky Way galaxy. The diameter is in minutes of arc as seen from Earth. For reference, the J2000 epoch celestial coordinates of the Galactic Center are right ascension 17 h 45 m 40.04 s, declination −29° 00′ 28.1″.

  7. Melotte catalogue - Wikipedia

    en.wikipedia.org/wiki/Melotte_catalogue

    The Melotte catalogue is a catalogue of 245 star clusters compiled by British astronomer Philibert Jacques Melotte.It was published in 1915 as A Catalogue of Star Clusters shown on Franklin-Adams Chart Plates. [1]

  8. Mass segregation (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Mass_segregation_(astronomy)

    Many globular clusters, such as the 13-Gyr old cluster M30 (pictured), are mass segregated. In astronomy, dynamical mass segregation is the process by which heavier members of a gravitationally bound system, such as a star cluster, tend to move toward the center, while lighter members tend to move farther away from the center.

  9. Shapley–Sawyer Concentration Class - Wikipedia

    en.wikipedia.org/wiki/Shapley–Sawyer...

    The Shapley–Sawyer Concentration Class is a classification system on a scale of one to twelve using Roman numerals for globular clusters according to their concentration. The most highly concentrated clusters such as M75 are classified as Class I, with successively diminishing concentrations ranging to Class XII, such as Palomar 12. (The ...